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You are allowed to maintain a car (take it to a garage, get an MOT etc). If you leave a car for too long without moving it you will have problems before long. Seems reasonable to go and pick it up.
Be prepared to jump start it if the battery has failed and perhaps put some air in a tyre though.
jellybaby-
You are allowed to maintain a car
It's illegal to leave the house or be out of the house for any reason other than the ones on the list. Patronising any business that's open is on the list, which include getting a service, MOT, etc or even buying a used car. Leaving your property to do any sort of DIY maintenance is - by the letter of the law - illegal.
So going to pick up the car is illegal, but going to pick up the car to take it to a garage to have furry dice installed is not.
(this is of course a total nonsense and millions of people are breaking the law every day)
grams
I suspect I know what the answer to this is... I left my car at my dad's place about 80 miles away from London in late November. I planned to pick it up again after Christmas but obviously haven't because of lockdown.
I'd quite like to get it back... is this something that would be allowable? My wife and I would drive to his house, obviously not going in or anything stupid, and then driving back.