Seat Maps in MMB not allowing change of seat ?

Hi

I was checking that my seat selection had not moved in PE (as we know there has been "issues" this year) and I note that I cannot change my seats on outward or return. Is this as PE is actually full or that a change of planes may be happening? (LGW to Montego bay 22nd nov rtn 3rd dec)

Probably reached the 60% quota for pre-requesting seats than an indication of a plane change.

The remainder will be released at OLCI (but check a couple of hours before that opens as seats sometimes opened up then.