The Coronavirus advice section of the RYA’s website mentions the following regarding access to boats in marinas, and presumably clubs with moorings:
The RYA is making representations to Government and the marinas sector trade body, The Yacht Harbour Association (TYHA) regarding the issues for boat owners arising out of the closure of marinas. This reflects the concerns of members who have contacted us about their inability to access their boats and protect their assets. We are acutely aware that worries about boat security, maintenance and the impact on insurance cover are all are creating anxiety and stress for boat owners at this time.
We are also making the case that there are many people who could visit their boat while adhering strictly to Government guidelines on hygiene and social distancing. For many, the opportunity to spend time on their boat and possibly do some simple maintenance or cleaning would greatly enhance their well-being and provide peace of mind in respect of the issues of concern.