Just my 2p worth.
I think the applicants for TR FO's will come from far wider than just RYR and EZY.
Think of all the 737/757/767 and Airbus family FO's that are currently employed by TCX, TUI, Jet2 and those who have left Globespan, XL, Silver Jet and zoom in the last few years that are making do with summer Seasonal Contracts, 7 months on and 5 months off contracts and also the guys with overseas operators that have been waiting for the market in the UK to pick up. I see a large amount of British FO's applying to BA.
It's going to be good for BA as there will be a lot of choice.