Three features make industrial sites some of the best solar candidates in the UK. First, roof scale: large, unshaded, low-pitch roofs give more usable array area than almost any other building type. Second, daytime load match: production, machinery, and HVAC run during daylight hours, so a high share of generation is self-consumed rather than exported, which is where the strongest returns come from. Third, high baseline demand: energy is a material operating cost for manufacturers, so every kWh generated on-site displaces grid electricity at full retail rate.
Combined, these give the payback periods and IRR figures cited above, with minimal disruption to production when installation is scheduled around your shift patterns.