No problem. Design and construct your additions or alterations to the 16th or 17th edition and provide the relevant certificate.
Come July it'll be 17th only.
Just adding a couple of points for anyone who reads this before they do their kitchen...
Get 47mm single back boxes if you can, getting all those wires into a 35mm single was a right arse.
Check the fittings will take the cable! In theory the cheapo sockets from Screwfix should have taken 2x4mm cable, but I couldn't get them in. The DP switches had even smaller terminals, so in the end I gave up and swapped them for Crabtree ones.
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