In reply to James Malloch:
There is a lot to be said for a trusted car, we hung on to the wife's 07 yaris for far more years than we should have done because it never let us down but it got to the point that we were spending more on wearing parts like brakes and tyres than it was worth.
Touching wood the replacement (a 2016 Berlingo) has been fine for tye 6 months we have had it.
If I trusted a friend I would put the car in their name rather than add them to your insurance, your risking your no claims.
The understanding would be they give it back in the same condition as it is now, if they use it loads they service it and maybe replace the tyre's, if they don't use it much don't worry about it and chalk up the loan to good karma.