I'll give you all the report on Iguana (remember that name) as soon as the argument about the bill is over. Day 1 -- the boiler was installed (well -- sort of ) The rads and TRV's stayed as they were. Day 21 -- system finaly up and working ( after 5 fitter visits to correct errors ). Makes you wonder how often they do it this way and gullable people just 'pay-up' and wouldn't know they have been screwed.