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The most obvious problem with the consumer unit is the lid can no longer be fitted because of the larger modern breakers that have been fitted. It looks like a new earth will be needed from the gas/water entry point to the CU.
A wiring insulation resistance test would reveal wiring condition. If you don't have any shared neutrals between circuits and the wiring is in good condition a replacement CU might be enough.
It's not like there aren't houses all over the country running similar setups to that without a problem but you might want rcd protection for sockets etc.
Airhead
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