Hi, our back boiler has finally given up the ghost. Its an old house and we are in it a few years. It has always worked fine till now but we need a new gas valve. We had a gas serviceman out today and he is doubtful he will be able to get a replacement valve as the unit is so old. Any ideas where I could perhaps try to source this online or anywhere in Ireland or is it a hopeless cause? Its a HoneyWell 4600C1029. I know we should ideally change an get a new boiler and get rid of the back boiler but we want to try and wait a couple of years till we are doing our kitchen and do it all together. Any advice would be great, thanks