Apologies Centre Cities, you're quite right, I do believe the crew will be SOU based, Thomson have a habit of sending LGW crew to BOH for the cruise flights so it's reasonable to assume that they will be SOU crew.
However, has anyone spotted the irony with interlining/Code Sharing with Aer Lingus to America? This I believe was available with the Aer Lingus Regional/Aer Arran flights last year (when times suited!)