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Yes, assuming the wiring is in spec and the circuits test ok then you can use the existing wiring. With only 4 circuits the job should be quite easy. The wiring can be extended to suit the new cu if needed, there are quite few methods for this.
Not sure on cost as it varies so widely. A simple consumer unit probably costs less than £100 in materials.
Main bonding has to be placed close to the entry point for gas/water pipes. Within 60cm from memory.
Airhead
@Greenbank
Assuming the wiring tests OK can the consumer unit be replaced on its own? (e.g. using the existing wiring?)
Or does it depend on whether the existing wiring will stretch to the new CU and, more likely, it won't so new a partial/full rewire is inevitable?
Rough idea of cost (best/worst/likely)? (3 bed flat in SW15 all on one floor)
(There are gas and water pipes are within 3m of the current CU. Reminds me, British Gas said something about the gas pipe bonding when they replaced the gas/elec meters with smart meters a few months ago, they said nothing about the old CU though.)