>> a lighting MCB should be 6A
With that number of 50W lights it could well be that you're exceeding the rated current. The lighting circuit was generally designed to support 4 or 5 x 100w incandescent bulbs per floor, so if you're drawing more than twice that current I would expect problems.
Change them all for low-energy ones and you should solve things - and not get so hot standing under them either!
Oh, and your toaster's probably knackered, buy a new one.
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