I was kayaking at studland today and saw someone on an e-foil. Looked like a lot of fun. He eventually returned to his yacht so I paddled over to find out what it was.
He said they cost about 7 grand(!). He also asked if I wanted a go, I bottled it and said no (too many expensive crafts around!).
He said he sometimes follows the red funnel ferry from Southampton to isle of wight and once he is in the wake of the ferry he does not need to power the foil.