For sailing we are exempt due to being a RYA RTC, see https://www.rya.org.uk/club-centre-support/training/practical/aalr.Â
However this is only to support activities for our members, other groups using the lake might require us (or them) to hold an Adventure Activity Licence (AAL).
There is also guidance from HSE here: https://www.legislation.gov.uk/uksi/2004/1309/regulation/3/made
Question was raised by Simon L., to offer kayaking to other groups and Jeff S., provided this background information (Jan 2025).