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Matthew Thanks for reply, on the SM2 there is a 'link' it says for pumped systems remove it or gravity leave there. Whilst I have a pump, I am not sure if its a fully pumped system. I have tried both ways and it does not seem to make any difference. Are you saying put the two wires black and...

I have replaced the above but found there are two extra wires 1 black 1 red in the old 905 that went to a terminal marked B on the back plate but did not connect to anything on the timer. I have taped these off in the new SM2. Most things are now working, clock, water is heating and boiler fires...