Update following the ADT visit.
Their recommendation was to upgrade to a wireless system at a price of £249. The problem with this is that with this system I would no longer have the police response I currently have. In order to upgrade to a police response wireless system I would have to shell out a whacking £749 to replicate what I currently have. No way I can justify that.
The system (a domonial) currently works and should it fail it will be ADT's responsibility to repair/replace for free. So the other option is to move the control panel next to the new master socket.
Prices for this are:
£100 call out fee
£52 for 1 hrs labour.
A saving of £597.
Given that I am more than happy to give my 9 years so far business to another company, what are the chances of them waiving this fee to keep my custom?