Looking at the slab today I looked at te plumbing and the various locations a little closer. What I found is that I think there is a pipe missing.
I took some pictures and then went home to compare them with the subfloor plan in the work order. Unfortunatey there are only 9 actual pipes in the slab but the plans show that there should be 10! In the kitchen area the plans show 2 internal pipes for where the island bench will be linking through to 2 pipes at the edge of the wall. In actual there are the 2 for the island and only one for the wall.
I have called the SS immediately and left a message. Now I am waiting to hear back and see if I am right and we have a problem or not. Fingers crossed if we do it will be a quick fix and not delay the start of framing next week too much.
I am kicking myself for not seeing this error prior to the slab going down!!! But then again if there is an error they should have spotted it, not me.