There has always been occasions where crew are required at other bases regardless of the current crewing issues. On occasions I have had to postion and overnight in various bases including LGW and MAD and both with GB and Easyjet. You will see hallmark cars often outside Olympic House (MAN) and other crew rooms with Easyjet/TCX/MON placards in the window. There will always be crewing eventualities that require movement between bases.
That is why Easyjet (and other airlines) have an Hotac (hotel/crew transport) department not to mention for those (relatively few) nightstops which do exist and are planned into the schedule. DTM, DSA, BFS, TXL, MAD etc.