We, too, have not had our alarm go off without cause and our current one has been installed for over 20 years.
The problem with accidental soundings was a problem when alarms were first introduced, but it is very rare nowadays.
I cannot see the point of CCTV, what good is it if you are not in the house at the time. I want to stop a breakin at the time it hapens- as our alarm has twice. Not view it in detail after the event when the house has been burgled. What is the point in watching happen from elsewhere, especially if you are abroad. By the time you can contact the police and they have investigated, assuming they do, once again it is too late.
I am surprised your neighbours have had the problem you mention Borntosew, the noise our alarm makes in the house would drive any intruder out- or stop them coming in, once activated, its pitch and volume is agonising on the ears. We had to sit through it for an hour and a half (with a cushion to each ear), when a squirrel ate through the wiring one night. The alarm only went off in the house, thankfully, so we were the only people affected.