Corker! I like the look of that. [emoji106]Tell her you'll only keep your bikes outside if she install a couple of these:-
http://www.asgardsss.co.uk/bike-cycle-storage/insurance-approved-metal-bike-shed
I have one in the front garden - it's been had a go at a couple of times but it's resisted all attacks so far. I've also installed a ground anchor in the base so even if someone manages to get the door open, they still need to get through a heavy duty chain to take the bikes.