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Could the better and wiser assist with an odd one...?

I've just finished a big CU swap on a 1950's house that uses single core & earth lighting circuits. All but one of these are fine, but the faulty one is pretty funky;

There are 3 accessories on this circuit in 3 separate rooms. The first room/switch/pendant works fine. The later 2 have the same issue - with no lamp in the fittings all is well, but put a lamp into either with the switch on and 3 things happen:
- The bulb glows very briefly (30mS?)
- The RCD covering this half of the CU trips
- The 6amp type B MCB covering the circuit trips

If this was just an RCD issue I'd be confident of a neutral/borrowed neutral issue, but how can a bulb (which doesn't blow/fail during this) cause an MCB to trip?

It's got me going round in circles so any clarity and advice is most welcome.

Thanks
 
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