The white wires are for the ignition for the fire part. Got the back boiler ignitor working, can hear gas when the pilot button is pushed, will not light pilot. Ignitor must be bent away from pilot jet or something. Tried a lit bit of rolled up newspaper but no joy yet. Will get some long spills tomorrow and try that. (The missus is getting tetchy, no staying power women have they!!) Thanks for all your help so far, i will go put the rest of the house back together now!