Hey Everyone, thought id share my latest shocking discovery. i was replacing the combi boiler anyway as it hadnt been working for over a year (big ole pile). when i went up into the loft to remove the flue this is what i found. the flue had been sellotaped at each joint and when i removed the tape i found a gap so big i could fit my finger in there, also the inner flue had the same gap at 2 of the joints. apparently the guy who fitted this boiler was registered and retired a few years ago. yet no paperwork trail not even the benchmark. might post these into the gas safe magazine.