themocouple ?

I am just an unqualified muppet and my advice is worthless - but if it was me I would do it myself.

People may follow this answer and quote Gas Safety (Intallation & Use) Regulations 1998 and crow on about the dangers and illegality (there is potential danger but no illegality) of doing it yourself.

These two links may help you make up your own mind...

http://en.wikipedia.org/wiki/Gas_Safety_(Installation_and_Use)_Regulations_1998

http://news.bbc.co.uk/1/hi/england/shropshire/8438396.stm

Good luck...

Peccavi
January 2010