Not illegal just not correct
also remember that on the cos the insurance is only for third party NOT fire and theft, but your dad would be mad if he was to say YOU drove it to whereever it was parked when it was stolen/burnt out

The small print that might be the insurance companies get out would be that in most cases on this type of insurance they say, drive any other car "IN AN EMERGENCY", now what they call an emergency could prove different to what u call an emergency , when u ask most companies when taking out a policy they will say oh that dont mean nowt, but if u was to try and claim then it could come into play.

Mind u, got muggins here that declares everything including bloody nitrous
so all I said may be a load of crap

Mo