Reply to thread

Well I am open to suggestions 

I have since found there is an option under the Marquee tool to specify the size in inches which is perfect, so if if I start with the background image I can then use the Marquee tool to specify the size in inches that I need for each cut out where the Image is going to be dropped in later

There is never any soft edges or anything, the back ground is a solid colour and there could be three or four images on the canvas so the tricky bit has always been getting the gaps between the images all exactly the same