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Thanks very much! I might swap it today!

Oh right cool, so I don't need 5 at all? It was only linking to N anyway? So B's together and pushed into backbox C's together and pushed into backbox N to N L to L 1, 3, 4 is 1, 3, 4 on new programmer and remove link from 5 to L Thanks!! :)

Right I'm modernising my Kitchen, I have an old grey boiler programmer that I'd like to swap to my new programmer. My old Programmer is a Potterton EP2002 My new Programmer is a Honeywell ST9400C I read on a forum that it is possible to change over, however I didn't realise so many wires...