But then I live somewhere where we happily lend the neighbours hedge-clippers, flexes, chain-saws or standing room for vehicles for a couple of days. Anything longer would probably require a more formal agreement, so I am not criticising OP for mentioning this aspect - just surprised it was her initial reacton.
So do we, grandtante, thank goodness. I might have said "can I think about this" then a few days later say I'd made further enquiries and explained the legalities involved.
I still don't know the implications of allowing a neighbour to park short-term on a drive? Would we be liable if a branch fell on their car? We do have insurance.
Eg up to three months?