I was quite surprised to get this, bank holiday travel is usually very busy without any offer like this!
Also, far too late for those going away as they generally wouldn't leave booking this late, so I don't see much long distance use except possibly into London where accomodation is probably still available. Otherwise mostly day tripping last-minute
May help a few Plymouth Argyle fans to get up to London for the playoff final at Wembley on Monday a bit more cheaply (and/or England/Wales fans to get to Twickenham on Sunday!)