Thanks Kamil for responding so quickly.
Just a couple of thoughts:
1. Why does the system cost £2,000 a year to maintain? What goes wrong with it every year that is so expensive to fix?
2. Who pays for the cost of the calls from the intercom to individual flats? Presumably the panel on the street must be connected to a phone line that incurs line rental and call fees?
I wonder if we aren’t actually paying rental for the service and Anchor Doors are simply labeling it as a ‘maintanence’ (ie subscription) fee? Two grand a year seems a lot pay for the cost of a phone line and calls, plus the occasional call out to fix the panel if and when any problems develop.