@Sarah6013 Perhaps its time to make friends with a neighbour. There must be someone in the block that would like some extra money in return for letting people in.
Thanks, Do you have any experience of portable key lockers? Securing to a wall is not going to be an option for me as its a large block of flats. thanks
I have the same issue. I use a keybox that looks like a padlock with a code. I attach this to a heavy duty motorcycle chain and secure it to a nearby bike rack.