LGW seems to be main focus for TS these days. MAN and GLA only have two routes now with YVR being seasonal. When you look TS have cut a heck of a lot from the U.K. - LHR, BHX, CWL, EDI, NCL, EXT.
YUL is apparently on Primera’s radar but I can only assume from CDG as there would be little to zero demand from STN and BHX.