Thanks for the feedback guys. The Contact switch on the utility room leading out to the garage is a lockable external grade door rather than a standard internal.
 
	 
 
	That being the case, would you remove or keep it in place?
 
	 
 
 
	 
 
	Haven't put anything upstairs. Was thinking about putting a PIR in the upper landing but there's no real access to upstairs windows unless someone brought a ladder. What's your thoughts on this?
 
	 
 
	Thanks again for the help. Much appreciated.