I've heard that we can book a First aid course run via Releasing Potential. The cost is £75 - very reasonable compared to most - and will of course contain water safety components.
There is an opportunity to book for Saturday 16th October - 8.30am to 5pm though they can be flexible. When I first posted suggesting a course, there were 7 takers. Hopefully, those 7, or others, are still interested!
Please could you sign up here if you'd like to do the course - I'd need to let Emma in RP know.