Thanks for all the advice as you may have guessed I have no experience in this field ( just like my engineer ) but will try and answer the questions.
Yes he used his multi-metre and said the resistance on the fan was reading 9 and didn't know if that was good and would check with WB. When he came back the next time he told me 9 meant it was bad and should be closer to 300 as told to him by WB, He was also told remove orange wire and do something ( sorry cant remember that bit) and if fan started it was not the fan. He did all this and said it will be the valve. When he comes back today I will mention the pump etc, I cant check that as the boiler is not working at all but will get the traps etc checked. The reset when it first stopped I did try a reset and it tried to start and then nothing, further resets did nothing. So far he has changed the following:
fan, wiring loom, gas valve and today it's the board.
Thanks everyone for all the advice so far, if he does manage to fix it I will make sure i put the reason on the post.
Cliff