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This will do the job
AstroAI Digital Multimeter, TRMS... https://www.amazon.co.uk/dp/B07FDBW1PT?ref=ppx_pop_mob_ap_share
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https://www.screwfix.com/p/lap-ms8306d-digital-multimeter/161fg#product_additional_details_container
I like the look of this because I need to pop to screwfix anyway, and it offers no contact current detection (I assume this is when you can touch insulated wires to see if they’re live) which would be useful as under our floorboards is a nightmare of various cables of various vintages.
Need to buy a multi meter - any suggestions? Was just going to buy something reyt cheap off ebay.