Two choices.
1. Get the work done by a part P registered electrician.
2. Put in a building notice with the council, get an electrician to do the work or do it yourself, then get the installation tested by a competent person. (Normally this would be a qualified electrician but in this case they DO NOT have to be part P registered)
I went route 2, did the work myself then got it tested but I had to put in a building notice for some construction work anyway.
Or unless the cable through the garden is fixed, because if it is then the Building Regulations apply - it doesn't matter whether there is a plug on the end of fixed wiring or not.
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