Still doesn't mean there isn't a shortage of trains, may have been a shuffling of the pack with the 755s put elsewhere for the moment and a couple of 156s leaving the fleet, since two 156s were due to leave this weekend.
156422 is the worst of the lot, guard called it 'snail' last time I was on it. Hopefully it's one of those which have been sent away, but it's going to need some TLC from wherever it goes next because it struggled to get above 50mph, let alone more, losing 15-20 minutes or so on most journeys en-route.