Here's todays problem for you all. pilot won't light high enough to even touch the TC and slowly diminishes whilst your still holding the knob in to lower than the level of the pronged thingy where the flame comes out of. I've stripped it back to the weep tube and blown through with dust air so there's no crap in it at all. Also i've tried adjusting the pilot with the pilot adjusting screw and no matter where i turn that it doesn't alter the size of the pilot flame. I'm thinking its the gas valve (which looks like a gloworm 45 from the old back boilers - black knob with orangey red pics but apparently it isn't according to UK Gas at Brighouse). Or maybe the valve solenoid? Can anyone shed any more light on todays topic? Sorry to be a pest but all the replies i'm getting IS teaching me and i am grateful.