Hi Guys
Ok I found the problem bioler now running sweet- it was as most of you thought the flue wasn't connected properly- one of the elbows had a screw missing off the pivots as a result the inner flue had been pushed to one side and was causing the obvious.
Notes just for reference:-
There was no reducing ring restricting the outlet on the flue, the length of the flue is 2mtrs and has two 45 degree bends in it making a dogs leg - so the way I see it is that this would be at max if the bends were 90 degrees but I don't know how you rate a 45 degree- would this be half a meter?
I was wrong on the diameter of the flue is is 100mm - but it was originally fitted by British Gas so I would have though this was correct?
Anyway I have placed a few oxi testers around the attic and the bathroom just to be sure.
Thanks to Baxpoti, nickso, gas4you, namesag, and Agile. Thanks for all your help.
Now all I need to do is find the ribbin git that nicked my new sat nav last night!!! Dave
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