Thank you Guys! Good advice all round!
doitall and mickyg - I agree which is why I decided to post and get advice.
slugbabydotcom - I've had a good look under the covers and came to the same conclusions as your suggestions. The flame is not strong enough to reach the t/couple and the...
I have an Olympic 38/50B wall mounted boiler which has given some problems. A couple of months ago the ignition light went out and would not stay relit. An Engineer fitted a generic thermocouple, which didn't fit properly but seemed to do the job. More recently, we lost the ingnition light...