Re: pond pumps .. are they usually 230V? Only ones i've come across have been 12 or 24V with the transformer located inside.
There are plenty of low-voltage types available here too, but also many 230V submersible versions.
Outdoor outlets with the locking/sealing ring were also once common in Britain, and are still available. I think I have an old BS546 type kicking around somewhere. I'll post a photo later.
