I think people expect that if Crete is secure Polesti will get pummelled from May 1941.
I on the other hand see the scope for 201 Naval Cooperation Group or 202, 204 and 205 bomber groups to work from Crete as well as Africa on theatre tasks. Sure 205 Group had Wellingtons but they'd be employed on 'Theatre Strategic' tasks such as bombing Greek ports or mining the Corinthian Canal etc rather than on 'Combined Bomber Offensive' tasks.