We did the same in July, Spriddler - a week near Windemere followed by a week near Cheltenham after our cross channel plans were disrupted. Came to the conclusion that if that is the future for using the motorhome it will be up for sale ! A very second rate experience compared to going to Europe.
We did manage to get a couple of weeks in Germany late September by using the Tunnel & proceeding straight to & from Germany & so avoided having to quarantine on our return, so not all was lost. We were lucky, as Germany imposed a 14 day quarantine on UK visitors a couple of weeks after we got back.