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I am suggesting to have a look at your insurance specs and make sure it lets other persons be using your car
As I understand it, only someone who has an insurance policy of their own which has a 'driving other cars' allowance can drive other cars.
I don't think there is such as thing as 'other drivers driving your car' cover. Additionally, if you had a policy with driving other cars cover, you'd only be insured 3rd party so you'd be asking quite a lot for someone to lend you their car.
Some insurers will add a named driver for a short period of time.
Or you could take out a policy for someone else's vehicle and cancel it the next day and you might get a full refund.
I did something like this for a motorbike I bought before I'd sold the previous one and I got like a 90% refund after a week or so.
I am suggesting to have a look at the insurance specs and make sure it lets an other person but not only you be using a car