Aaaarrrghhhhh!! (*&^&^%*(*!
That's better.
OK, I have managed to stumble across the answers to many of the problems associated with connecting to a work LAN from home and for the most part it works well.
I have 3 PCs at home: 1 running Windows 7 connects through a VPN, I am able to access the server and print to the office printer. All good.
The other two are running Windows XP and while I can create and connect to work with a VPN, I cannot access the server/printer or router... WHY??