Is it possible to set up the unifi system in such a way that only one device, my TV, goes through a VPN (to view content from the UK) and all other devices not to use the VPN?
If so, how would I go about doing this?
Also, is there a VPN provider which you can recommend?
This is easy and possible. Set up the VPN client. Then go to “routing” add new route, select your interface (your vpn that you setup) and select your device then set a description of your choice. Voila