Hi, thanks for the reply.
I suspected that it is something to do with the PE router on the MPLS network in that it only has details about the CE router eg SITE A ROUTER 10.1.1.1/32 & SITE B ROUTER 10.1.2.1/32

I would like some routing with no NAT, eg SITE A 10.1.1.0/24 & SITE B 10.1.2.0/24 and do away with the 192.168.*.0/24 subnets.
Is it possible or advisable to do this? eg SITE A has subnet 10.1.1.0/24 with ROUTER IP 10.1.1.1 or am I better to have the 192.168.*.0/24 subnets?

Also, would I be right in thinking that I have to contact the MPLS network provider to specify the above? All they have at the moment is the router addresses and no internal subnets etc.