OK...
after some investigation it looks at though the Avtech DVR does not like a DNS entry.
I realised (through pain) that the DVR is capable of DHCP. Not well documented and GUI is no intuitive or it just maybe that its the first DVR I’ve played with

... so i configured the DVR for DHCP and it worked! Obviously i needed to get it to work with Static as my kids feel the standby button and flashing lights mean "press me"... so when punching in the static info it looks as though the DVR (for some unknown reason to me) does not like a DNS server entry! It is only happy with ip/default gateway and mask
It working now.. slow due to 54Mbps gaming adapter but hey problem solved
But the Belkin router is pretty good compared to others i've worked with in the past...
Thanks for your advice and guidance... much appreciated.
P.s I am correct in saying that Virigin do not provide static ip addresses to residential broadband customers? Has this always been the case and does no Cable provider issue static IP addresses?
Cheers
P