I received an email which included links to Brexit advice from the Sports and Recreational Alliance. 

http://sramedia.s3.amazonaws.com/media/documents/fd52b99b-1652-4d47-be42-1147b94e3893.pdf

....and advice on your travel insurance from the BMC

https://www.thebmc.co.uk/how-will-brexit-affect-travel-insurance-bmc

It may be of interest to some cavers too.