No — five defined categories: business travel, employee commuting, waste generated in operations, upstream transportation & distribution, downstream transportation & distribution. Full Scope-3 inventories are not required by the PPN.
From our guide: Carbon Reduction Plans for UK Tenders (PPN 06/21 → PPN 006) — full context, charts and sources there.
Boilers, kilns, heat exchangers, valves and steam lines lose energy continuously. Inzonex makes patented (UK GB2508992.1) removable modular insulation — snap-fastened covers engineered per temperature tier, not generic off-the-shelf jackets: