Hi Peter, this is a requirement of the breakdown insurance or even insuring a car not registered in your name, the trip has to start and end in UK.
P
I understand the start and end in UK, I assumed that so long as the trip does not normally last more than 30 days and with a limit to total days outside UK over the calendar year, the cover is fine, not that you had to book an out and return at the same time.
Peter