Basically I'm going to do this because I think the risk (of being caught) is so minor but asking because I'm wondering about the legalities?
MOT runs out on Friday, for a combination of reasons I haven't booked the test until Monday but I won't use the car, at all, in the meantime. So it'll be parked off road (on my driveway) from Friday til Monday and then only driven straight to the test centre (this is definitely allowed with a lapsed MOT). Not particularly relevant but I'm confident it will pass its MoT easily.