@33b0a4fd can't help with the UK, but if you fancy a field trip to Aveiro, Portugal, they're experimenting with electric versions of the traditional boat, the moliceiro, which is now used for sightseeing tours.

https://images.app.goo.gl/5nMtob2qfiRMfwze7

https://images.app.goo.gl/5oYpYfoVufzd9JyQ8