We had the same problem. But you are better off re-wiring the hole lot because if you have a ceramic fuse board then your wiring/plugs/switches are bound to be in need of replacement as well. What I did was put a consumer unit between the main supply (and trip) and the ceramic fuses - you can then replace plugs, lights etc..as and when. I wired in all new plugs, separated the boiler and the only thing now going through the ceramic fuses is the lighting circuit. mike