1 hour ago, MrHappy said:

The thieves guild used to have burglary as a 2 man job, sensors wired in parallel would detect 2 men in the 2 separate rooms at the same time.

 

A common misinterpretation of the guidelines. The 2 man rule only applied in the City of London, in any dwelling house over 1200 square feet, or where the amount of silverware expected to be lifted would be greater than one sackful.

Forget that,  they all doing there own plumbing here 

I now have all sensors working.

I acknowledge that it is not advisable (or compliant) to wire more than one device per circuit since you cannot identify which circuit has activated but until I can upgrade the control panel this will suffice.

 

The following was helpful.

http://www.securitywarehouse.co.uk/forums/topic/46-wiring-2-or-more-sensors-onto-a-single-zone/