Changed OVM IP.... cannot access guests over network.

I moved my test OVM server from one datacentre to another. This necessitated a change of IP address for the server and the guests. I was able to update the servers details in the OVS VM management app and all is well. The VM management server did not move. I can start and stop the guests etc etc. However I can no longer access the guest over the network. I can access the guests when I am logged on to the OVS server, I can ping, ssh and do all the things you would expect, I can even ping from inside one guest to another guest so there is, fundamentally, nothing wrong with the guest setups that I can see. It would appear as though packets to/from the guests are not being 'forwarded' or some such. I have triple checked all my network settings from OVS server and 2 guests and cannot get it to work. From inside a guest if I ping the gateway address I get no answer.
Is there something tucked away in the bowels of the xen configuration that still has some old settings ?
Surely I wouldn't have to re-install just because I changed the IP ?
Any help would be appreciated.

Is the MAC-address for the Xen-bridge in vm.cfg on the VM Server identical to the HWADDR in /etc/sysconfig/network-script/ifcfg-ethX ?

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