In reply to Marc verity:
I speak as an electrician. I cringed when I read your op. Please, do not do this to yourself, it'll hurt at best. For a start, your 32amp socket circuit IS NOT SUITABLE TO CONNECT A 32amp HOT TUB TO! Do not try to do this yourself either, please. Secondly, where do I start? I could write an essay in response to your op. With lots of capital letters starting DO NOT......
There are regulations for a reason, and normally because someone has died doing something similar before. Please don't complicate my life with more regulations due to someone dying again.
I'm not over reacting, as pointed out previously, dipping family members in puddles of water connected to the national grid is hazardous to their health. Please take it as friendly advice from a professional electrician. Step away from the hot tub.