It now appears that the thief did not gain access using the door code – he simply kept calling different flats claiming that he was making a delivery until someone let him in. This was around 9:30 in the evening.

This has happened again on two evenings since, but on these occasions whoever it was did not get access.

If someone calls your entry phone asking to be let into the building it is important that, whatever they say, you do not let them in unless you know who they are. If they claim to have a delivery for you, ask them for the name the on parcel. Otherwise, please go down to the front entrance door to receive it.