I've heard allegations that BA is reconsidering the predicted downsizing of its LGW operation, but if EZY gets in there with anything like the kind of capacity they're talking about, will they have a choice? I don't think so; better make a graceful withdrawal than lose millions fighting EZY; it has the confidence, the war chest and the low costs to have life very unpleasant for BA.
As for ORK, I would not be surprised; low cost airlines on mainline routes, without much competition or downward pressure on fares, can do very well indeed - for instance, anyone try and get a cheap fare on FR's LGW-DUB??!!