Change of router and my System is down

I have had to change my router and since doing so the Sonos system has gone AWOL.

I had to move the NAS to the new router, and since the new router uses a set of addresses in the 10.0.0.x range I had to get rid of the old fixed IP 192.168.1.201 that I was using in favour of a dynamic assigned IP from the new router.

The old modem router remains in service as the modem only, with an IP of 192.168.1.1

When I attempt to connect to sonos I get an error 'Your system cannot be found.'

I have reset the controller (bridge) and linked it to one device. That operation completes OK but when the system moves on to the 'Connecting to your network' stage it just hangs.

Any ideas please folks?