I doubt it will come from STN every week, it just so happened that they had their second summer aircraft which was due to leave STN anyway. I’d imagaine it will come from MAN/BHX/LGW in future unless the TFS base is opening soon. I asked the same question on here recently but it would appear there is no TFS base this year.
The ABZ flight on Sunday was operated by G-FDZR which positioned up from EDI on Saturday and is still there now whilst G-TAWL (coincidentally the one that operated STN-NWI-TFS-NWI-BHX) has positioned up from BHX to EDI for tomorrow’s TFS flight.
I’m not sure if LBA, HUY or any others will be served this year.