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For future readers or those that may be interested, the new style MCB fits straight in to the old style base.

Yes it seems fine, it looks in very good condition. I think this is going to be one of them things, because everything is fine now and I can't get it to trip. I've had a good look at all the wiring that I can and looked at the wiring in all the light switches and it all seems fine. Thanks...

Recently no work has been done, it just started happening yesterday. The suspect MCB also wiggles and none of the others do. If I can get a like for like replacement I'll just bob it in, and if the problem persists I'll call a spark

Thanks for the advice, I still think I'd like to replace the MCB first just on the off-chance as it'd be a lot cheaper than calling an electrician out. Do I just pull it out?

I took the fuse out of the alarm, and the lights still tripped so it does look like its the breaker. Do I just turn the mains off and pull it out to remove it?

You're quite right, it seems the house alarm takes power from the lighting circuit, one more thing to check....

SWMBO wants it fixing today

Hi, Looking for a little help please as there is a problem on the lighting circuit. It doesn't seem to be related to any particular light or switch as the circuit breaker will trip even with all the lights switched off, and the breaker itself sparks when you try to untrip it and hence won't...