@wayne.innes: Work Carried Out Disassembly & Cleaning: Drained and removed bottle traps from affected urinal units. Cleared accumulated debris, sludge, and scale build-up from trap body and tailpieces. Mechanical Descaling / Electromechanical Cable Machining: Fed electromechanical flex-shaft / cable machine directly through waste pipework running into the wall panel. Mechanically descaled and cleared internal pipe runs to remove hard scale deposits and restore full bore diameter. Reassembly & Testing: Reinstalled bottle traps with clean seals. Flushed system thoroughly; confirmed free flow to local inspection chamber without leaks or back-up.