ANSWERED DD-WRT router behind DSL Router not connecting?

[wuffles 7]

I've decided to go down this route (see below)...no idea what problems it will throw up but it would be better for my particular scenario.

 

Ideally I would like to continue using non vpn route for most things, seems to cause a slight lag sometimes but it could be our slow rural broadband causing the issue, also I have all the other APs knocking about the property playing nicely with each other through router A. But I have a need to force a NAS box through the vpn and if required connect clients on an adhoc basis to the VPN router (router .

 

^^ http://superuser.com/questions/502980/running-two-wireless-networks-with-two-different-dhcp-ranges-virgin-media-supe

 

If you can see any huge flaws in this please do step up and shoot me down.