I sent you a tat pan & tilt camera with some other junk.
I'd had some others off the same ebay seller which went on a couple of jobs & they where brilliant for the money
they changed model & the replacement was "meh"
i believe the 9800 launched 1988ish with a white a4 manual which became a better quality a5 grey booklet ?
whilst I'm happy to work with old shite, its very hard to employ people to work with shit they've never seen...
Probably eng reset on tamper
A cr123 from risco is going to cost a lot more than £2
Setting & unsetting a one way radio has no effect on sensor battery life
The sub wanted to recover the cost of the alarm repair from the electric co. or builder, the documentation from the alarm co. prevents this
I'd expect a small radio system, fully comp with an app to a little less than your figure.
However I'm in the North of England
If your in the South or have proper monitoring your figure sounds okay or maybe even cheap...
Running a co. is expensive, £15 per month is unlikely to make many millionaires