thanks everyone!
we have one of the old baxi boilers in an old 1950's house, i swear it hasnt been changed since the house has been built! it had a replaced valve last yr after 6 months of no heating cause we had our wedding to pay for but thankfully we dont have to pay for any work to be done on it as andy's uncle is a gas man!
He thinks it could be a box attached to it and could be replaced for £25 so we're going to wait for when he can come and look at it.
Today i went for my 4th weigh in and lost 2.5lbs so i am happy with that, if i loose another 3lbs next week that will be 1.5stones in my first month on cd!! YAY!