Hopefully as it's an oldish car, the cost of repairing the ignition won't be too high.
Still it's bloody annoying I grant you.
Apparently my car is quite likely to have its spare tire stolen as it lives slung under the boot (released from inside the boot via a nut). This seems to be a bit of a design flaw in the 306, but at least it's not the whole car at risk.
Good luck with the police