In short: UK food and drink manufacturers operate the country's largest manufacturing sector by employment and one of its harshest environments for connectivity. Wash-down regimes, allergen controls, and ever-tighter traceability requirements punish copper, fibre and WiFi alike. Private 5G fits the way food factories actually run — and the use cases pay back fast.
Key Takeaways
- Wash-down environments destroy conventional networks — IP69K equipment survives the daily caustic and steam regime, but the WiFi APs and cable conduit feeding it generally don't, which is why food plants run on a patchwork of vendor-specific radios
- BRCGS, allergen and traceability rules now demand continuous data — line-by-line lot tracking, CIP cycle logging and allergen-changeover validation generate data volumes that wired retrofits can't keep up with
- The CAPEX case is led by changeover time, not labour — every minute saved on allergen changeover or CIP validation is a minute back on the line, and that's where a connected food plant pays for its network within months rather than years
In a nutshell
The sector everyone underestimates
UK food and drink manufacturing is the country's largest manufacturing sector by employment — over 450,000 people directly, around 4.5 million across the wider supply chain — and its single biggest manufacturing sub-sector by gross value added. It also has more sites than any other manufacturing vertical: roughly 12,000 food and drink production facilities across the UK, from Cranswick's pork plants in Yorkshire and Hull, to 2 Sisters' poultry operations across the Midlands and Scotland, to Bakkavor's chilled prepared-food sites, to Greencore's sandwich and food-to-go factories, to Premier Foods' bakery and grocery sites, to Müller and Arla's dairy plants, to Warburtons' bakeries, to AB Sugar's processing operations.
The sector also has a quietly worsening connectivity story. Industry 4.0 conversations tend to centre on automotive and aerospace because those are easier to film: shiny robots, white floors, AR headsets. Food factories are messier — wet, cold, noisy, often refrigerated, often hygienically zoned, with continuous-flow production that doesn't pause for IT projects. They are also where the most measurable productivity wins are sitting, untouched, because the underlying network infrastructure can't carry them.
What makes a food factory's environment unusually hostile
Three things separate a food plant from most other manufacturing sites:
- High-pressure caustic wash-down, often three to five times per shift, on equipment rated IP69K. Stainless steel and food-safe sealing survive that regime. Cable conduit, junction boxes, WiFi access points and copper-fed sensors do not — at least not reliably and not for very long
- Strict hygienic zoning between raw and ready-to-eat areas, with physical barriers, separate air handling, separate uniforms, and rules about anything moving between zones. Running fibre or copper between zones means breaking a hygienic boundary; running wireless between zones is much easier to certify
- Allergen controls that require complete physical and procedural separation between products, with documented validation of every changeover. This is what BRCGS Issue 9 (the dominant UK retailer-driven standard) auditors increasingly want to see in real-time data rather than paper-based records
These three combine to make conventional networking deeply painful. Cable runs need protective conduit through wash-down zones, which corrodes. Outdoor-rated WiFi APs survive the wash-down better than indoor ones, but still age fast in caustic environments and can't be easily replaced without disrupting production. Vendor-specific radio systems multiply across the plant — one for the metal detectors, one for the weight checkers, one for the line scanners, each with its own network, its own diagnostics and its own gaps.
The result is a plant where production data is genuinely abundant at the machine but genuinely scarce at the MES or ERP layer above it, because the network between them is the weakest link.
What the regulators and retailers are now asking for
BRCGS Issue 9, the FSA's food traceability rules, the upcoming Defra reforms to Food Information Regulations, and the major retailers' own audit programmes are converging on a simple expectation: continuous, verifiable, real-time data on what came off the line, when, and what was done to it.
Specifically:
- Line-by-line traceability to a single lot, including raw material origin and CIP (clean-in-place) cycle history
- Allergen changeover validation with timestamps, swab results and equipment-state evidence
- Cold-chain compliance from arrival of raw materials through processing to dispatch
- Date-coding verification at line-speed, with vision-system data retained for retailer audit
- Environmental monitoring — temperature, humidity, ATP swab cadence — across hygienic zones, with continuous logging rather than spot checks
None of this is impossible on a wired network. It's just that the wired network has to reach the right places, survive the wash-down regime, and keep up with the data volume that comes from doing all of this continuously rather than at audit time. In practice, that's why most UK food plants still do a significant portion of their compliance work on paper or in spreadsheets — not because they don't want the digital workflow, but because their network won't carry it reliably from the wet end of the line to the office.
Why private 5G fits the shape of a food plant
A private 5G network solves five problems at once in a food manufacturing environment, and that combination is hard to assemble any other way:
- One network covers indoor wet zones and outdoor yards, including refrigerated areas, with radio coverage planned around the building geometry rather than retrofitted to existing cable trays
- Devices can move freely between hygienic zones without breaking physical seals, because the wireless layer ignores the zoning boundaries that wired runs would have to cross
- High device density supports the dense sensor estate that modern processing lines run — vision systems, X-ray inspection, metal detectors, check-weighers, temperature loggers, ATP swab tablets, operator wearables, AGV/AMR fleets, all on the same network
- Network slicing keeps tenants separated when there are multiple production lines or co-located co-packers on the same site, without standing up multiple physical networks
- Wash-down survivability isn't a problem the radio layer has to solve, because the antennas live above the production floor on rated mounts; the only equipment in the wet zone is the IP69K device itself
That last point matters more than it first appears. Every food plant engineer has a story about cabinets full of dead APs that were specified at IP65 and didn't survive the first quarter. Private 5G moves the network infrastructure off the production floor and into the ceiling space, which is a much friendlier environment.
The use cases that actually pay back
The Industry 4.0 sales deck for manufacturing tends to list a dozen use cases and let the customer pick. In food and drink specifically, three pay back fast enough that they're worth treating as the lead cases:
-
Allergen changeover validation. Every changeover from, say, a peanut-containing line to a peanut-free line currently requires a documented clean and a paper trail. Connecting the CIP system, the swab tablets, the line-state sensors and the operator confirmation into a single workflow on private 5G typically cuts validated changeover time by 20–40%. On a multi-line plant doing three to five changeovers a day, that's an extra shift's worth of production per week per line
-
CIP cycle optimisation. Clean-in-place cycles use enormous quantities of water, heat, caustic and time. Continuous sensor data — turbidity, conductivity, temperature, flow — fed into ML models lets the cycle stop as soon as the target is hit rather than running the conservative default. The water and chemical savings alone often justify the network spend
-
Real-time OEE and downtime attribution. Knowing which line stopped, why, and for how long, with the data automatically captured rather than chased from operators at end-of-shift, is the foundation of every productivity programme. Most UK food plants run with patchy OEE data because the network feeding the line PLCs can't keep up. Private 5G makes that data continuous and reliable, which makes the productivity programme actually work
A network that pays for itself out of changeover time, water and chemical reduction, and OEE-driven productivity gains tends to find a budget. The barrier is mostly that the food plant engineering team has never had a credible alternative to the WiFi-and-radio patchwork they've been managing for fifteen years.
What we'd build, and why
Food and drink manufacturing is a sector where the connectivity gap and the productivity opportunity are unusually well aligned. Plants want continuous data. Auditors want continuous data. Retailers want continuous data. The network underneath is the one piece that hasn't kept up — and the conventional answers (more WiFi, more vendor radios, more cable) have stopped scaling.
Aerix builds private 5G networks for environments where conventional networking has failed: outdoor sites without coverage, indoor industrial environments where WiFi can't sustain density, multi-zone facilities where wired runs are impractical. Food and drink plants are squarely in that envelope. We design the radio plan around the building, manage the network as a service, and integrate with the MES, SCADA and ERP layer above it.
If you're running a UK food or drink plant and the gap between what your auditors want and what your network can deliver is widening every year, the answer isn't another WiFi controller. It's a network that was built for the environment you actually operate in.