Newbie Help

Hi,
Guess what - I need a burglar alarm (UK).

I understand from the police website
(http://www.met.police.uk/crimeprevention/alarms.htm) that I should be
looking for wireless alarms conforming to BS 6799 Class VI ( cant find many
makers of those) or wired ones
conforming to BS 7042.

Frankly, I don't care either way if I have to wire it myself / get a
professional in to wire it / get wireless.
I'm going to have a cat - do you get PIR sensors which are tolerant of small
creatures ?
I have a coal fire in addition to the radiators - is this likely to cause
PIRs problems ?
I'd like the alarm to dial me up /SMS me if it goes off. Not so fussed about
dialing the police up.
I assume I need a PIR sensor for each room plus one for each hallway ? Is
this sufficient or do I need
motion sensors, window breaking detectors or anything else as well ?
What is a Quad PIR sensor ? How does it differ from a dual technology PIR
sensor which seems to cost
about 35 quid each ?

Any pointers to literature or your opinions would be most helpful. I've
tried to do a bit of reading before coming here, but haven't yet got a feel
for who makes the best kit. My budget is up to 1K - is this reasonable ?
What would be the installation charge ballpark for a wired system ?

Dave