Well, it seems that we are out of time so to speak. Decision time looms.
You could just go for Arcade Club around mid September. Manchester has loads of flights available, and I'm sure you could do Leeds Bradford or Newcastle and take a train. Hell even Liverpool or Birmingham are only a few hours away.
Make it happen. If there are no good flight deals, keep checking. Chances are you will get a deal at some point (prices may go up as well as down, depending on demand). Or you can always take the ferry to Newcastle or Hull and drive the rest.
Whatever happens, make it a DLF rule that Eurocade suggestions must be in by April and a final decision on May 01 perhaps. Give every one a chance to plan ahead.