A VPN connection is a secure tunnel, traffic traveling across it cannot 'see' anything else on the network it is passing across, all it can 'see' is the other endpoint of the VPN connection which is going to be a server at Fon.
In the same way you can't see anything if you go through a tunnel apart from the inside of the tunnel.
Virgin (ADSL) => Namesco => Newnet => O2 => Plusnet => Zen => Newnet => Zen => Freeola => Vivaciti (using O2 Wholesale DSL) => Xilo (C&W Wholesale) => Xilo (O2 Wholesale)
Router: Billion 7800N
Note: I don't lay turf for anyone. astro or otherwise, all views and opinions expressed are my own based on experience.