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cheers - I'll give it a go once the weather has settled down a bit :P

Hi, Thanks for your input. This is the instructions with a circuit diagram http://www.screwfix.com/sfd/i/cat/pdfs/36/p4734536.pdf I'm no expert so confused with whether 'N' is actually at term2 or term3.

Same thing happended to me last week - replacing the same Potterton PRT100 with the Honeywell and blown the 3A fuse on the timer/program switch. I replaced the 3A fuse and reconnected the old thermostat to make sure the boiler is still working ~ phew! Not tried any other combinations yet...