How not to install a new security code entry system

I live in a small block of flats. Sometime in November, we got a letter from the freeholder management committee saying that, to improve security, a new security code entry panel would be installed in December. The code for this panel arrived a few days later.

Come the end of December, though, nothing had happened. We had assumed that they'd just changed the dates and thought nothing of it. However, this morning, the workman turned up to install the panel. My girlfriend asked why it hadn't been installed before. The workman replied, wait for this, 'err - last time we installed it on the wrong building'. Genius!