Moved into our (mortgaged not rental) flat a few months ago. Alongside the flat, we get an enclosed numbered parking space in the downstairs garage.
Our neighbours, without asking, have starting to loan out our space to their friend, lending them their key fob!
We don't drive, so don't use the space constantly, but we regularly have visitors including my DF who needs the space as he is disabled. There is no way our neighbours could not know this is our space, as each number corresponds with the flat number.
AIBU to leave a note in the letterbox of the neighbours? Or should I leave a note on the car? Worried it will cause issue due to the fact we, perhaps obviously, don't have our own car to park there.