Beauty that article pointed me in the right direction!
I tried the command esxcfg-advcfg -s vmk1
/Net/ManagementIface
which is supposed to resolve "If you have your management IP address on a vmk number other than vmk0 the DCUI console will display the wrong IP address" may have worked in 4.x but not in 5
The way I corrected this was to create a new management interface 'vmk0', disconnect the host, reconnect with new management IP on vmk0, remove the vmk3 adapter, reconfigure the vmk0 to the correct address, disconnect and reattach the host. I was also changing the DNS and host file records whilst doing this.
All looks good now :smileyhappy:
Cheers for you time guys,
Brendan