I originally planned on making the cables safe and leaving them in place, in case I need to use them in future. But if I am to disconnect them at the CU now, I will probably also pull them out.
Ah - just spotted the bit about the shower and stair lift cables.
Quite honestly if they were safe under the floorboards when in use they will be just as safe when not in use, and on balance I'd say leaving them is safer than working inside a CU to disconnect and remove them, possibly disturbing other cables, if it's not the sort of thing you're familiar with.
If you're getting an electrician in ask him to remove them while he's doing the tests, it won't cost any more.
Nothing wrong with leaving the MCBs there - if you don't you'll have to pay for blanking inserts to be installed.
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