Thanks guys, Strange, i did a post earlier in the day and it is not here... The guides did not help. I found a ref to enabling nfs logging but could not find the log file !!
I resolved this in the end, the answer was
mount -t nfs -o nfsvers=3 ourip:/vcd_transfer /opt/vmware/vcloud-director/data/transfer
It seems by default it uses 4 and the windows machine uses 2 or 3 (i had 3 selected when i checked)
Cheers