Hugh ( Forum Chief ) posted about Claudine some 9 years ago but unfortunately didn't give her number. If he sees this perhaps he will message it to you.
We've used these people and have always been happy with them http://www.aandpgascontractorsltd.co.uk/
I think Claudine is no longer in business, but I've edited your tag, Emma, and by clicking on it you should now be able to find plenty of recommendations.
That could well be Lisa (Milo Heating) 07811 444564 - We've used her a few times and she's never let us down. She's local and a great person, knows her stuff, reasonable cost and reliable. Highly recommended.
That’s her Steve! As soon as I read the name I remembered! Thanks soooo much!!