Right, it took a while to get hold of the portable PC. It was in use running a battery discharge test which went on somewhat longer than I expected. Good for the client's customers.
I have plugged it into the two routers and noted the following lines of stuff:
Ethernet Adapter local area connection:
Link-local IPv6 Address is the same in both cases
IPv4 address 192.168.1.15 on primary 192.168.0.105 on secondary
Subnet mask is the same in both cases
Default Gateway 192.168.1.1 on primary 192.168.0.1 on secondary
I also note that there is also:
Tunnel Adapter Teredo Tunneling Pseudo-Interface with different IPv6 addresses (primary to secondary) and different Link-local IPv6 Addresses (primary to secondary).
In both cases the PC was connected to the internet by cable with it's wireless connection disabled.
I guess I need to put a few of the address differences into the manual setup on my freeview box and see if it connects?
Rans6.................