Hi - thanks for this.
As we'd found damage to our house front door lock, the police returned and told us:
a) they reckon they first tried to break in and nick the keys
b) they second broke the window as they were gonna try to roll it off the drive (which implies they have a truck and trailer).
Luckily for me my beemer has Stepronic, which of course in "park" locks the wheels.
Apparantly going for the keys and a "drivaway" is getting quite common, so for all you londoners, don't leave the keys visible or close to the front door, and if you can double lock the door (as this is what foiled our guys).