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Check your policy first. My old policy gave me 3rd party on anyone's car and my motorbike still does*. Unless you're very young or high risk it'll probably be cheapest to get them to add you to the insurance. To speed things up go on compare the market and write the answers to all the questions for your mate's call with their insurance company.
You can also get day insurance for things like testing a car, but normally it would be something like £25 to get added to a policy so not really vfm for a 3rd party policy vs being put on the proper main one.
*Also a word of caution to anyone who believes they have this, make sure you double check. There was a story on Pistonheads years ago where this was removed at renewal from someones dad's policy. They didn't notice, drove the sons car and got hit by another driver 100%. They had to cover both cars and compensation for the other driver. I can't recall the number but it was obvs 10s of £ks
Driving someone else's car:
I seem to recall that if you have fully comp insurance this usually gives you 3rd party cover to drive someone else's car, is that right?
What's the easiest way to get full cover to drive someone's car for a day or so, get added to their policy?