When you park and leave your vehicle for any length of time, just follow these simple tips:

Check you haven’t left your keys in the ignition or in the car
Don’t keep your log book in the car
Double-check your central locking has actually locked – listen for the clunk/click noise (if you’ve got keyless then look through the window to check)
Don’t leave your car with the engine running
Don’t leave anything of value in the car
Check the windows are closed