Answer: -We used SJ Shortman, based in Mill Lane and they came out to Bar Hill with no questions for a problem with our boiler. They are Corgi registered and did a good job at a sensible price. May be too close to town for you..but their phone is 01223 236383 (which seems to offer 24hr call out if you REALLY need that thing put in NOWYellow pages has a page of the local Corgi registered gas people, and the one in there out that way is Rogers COnstruction in Sawston 01223 837731 Got no idea what they are like though... -The cam.misc faq http://www.the-hug.org/paul/camfaq.html lists a few. Phone a few - you may find some are booked up for weeks. I did. I have used Milton Gas Services (C. 861810) and D Hatter (Lt. Shelford - C. 844866) who were both excellent.