I doubt there will be any rush of bookings for any route, until the quarantine issue is resolved and secondly, the FCO advice on overseas travel - which impacts "most" peoples travel insurance. Given the way refund matters have been dealt with by many airlines, this pay now & don't worry you can change/refund if cancelled- isn't going to cut the mustard with many. The majority will simply wait until both the above issues are resolved. The rare exception might be with Jet2 who have performed very well with customer refunds, thereby inspiring confidence in change/refunds if flights are cancelled. (All Jet2 flights cancelled until July 1st)