They look more like T.Is - the 500lb bomb was smaller, and the 1,000 lb a different shape; the rounded nose and longer tail fin cone look very like target indicator munitions. Somewhere, I have the original soundtrack to this footage, on VHS, with a former Squadron member, who filmed this, describing that particular Op, and I seem to recall it was a typical mission for the squadron, - Pathfinder target marking.
I might be wrong, but as far as I know, the Mossie could carry 500lb bombs, TIs, or the 4,000 lb 'ccokie', but wasn't 'set up' for 1,000 lb bombs.