Any Plumb Centre will supply parts but they have some branches which are Heating Replacement Parts (HRP) specialists, you can find them through yell.com, very competitive prices to and a reputable supplier to.
Beware of cheap priced parts as even a duff PCB can look good, you can get them from other suppliers and Ebay, but a lot of them require you to send your old PCB first and then if it is not suitable for exchange they will want more money from you and when they have your PCB you are in their trap.
You are looking at about £100 from Plumb Centre, be sure you need a PCB as they won't take it back, a comon fault with BAXI's is a bad earth either on the boiler or at your supply, this with prevent ignition, the ignition and flame sensor are the same probe and can also prevent ignition if faulty, these are about £15 each from Plumb Centre.
PE
Pat Erron, May 2010
