Fetched the alarm from Ruimsig. Bough an extra 3 Passive infra red's.
William assisted me in programming all the individual units onto the system so that all I'd need to do is mount the different sensors on the walls and doors. Have yet to do this but very impressed with the package so far. I had been quoted much more for a similar system installed but this one cost a lot less.
Being wireless should be very easy and tidy (no wires running all over the place) to install.