Injured Instructor.

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My son is learning to drive and is insured on my wife's car for this purpose; he's been driving her around for practice at pretty much every opportunity.
Last weekend she fell down the stairs and fractured a bone in her foot. Wearing the huge plastic boot she's been given to support it she now can't drive herself, so having the boy available to drive her has been quite useful.
Unfortunately, she's been told by a variety of people that this is illegal / will invalidate her insurance / is a really bad idea.

Any thoughts?

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Cheers gents, will advise