Yes, it's the LS80-LS100 - it was fitted when we installed a new kitchen and downstairs toilet 2 years ago.
I've had a few suspicions about the plumber used on the job (although I was assured by the project manager he was CORGI registered), especially after finding he'd attached the hot...
I have a Ravenheat combi boiler - not sure of the model number, but can dig it out later if relevant.
A few issues which may, or may not be related...
Ever since we had it installed there has been quite a long "lag" between turning on a hot tap and any hot water coming through (although...