The secondary router solution works well. I do that (though we use a Bouygues 4G box until our fibre is "soon" installed), with a router flashed with ExpressVPN, then log my Apple TV into that wifi network and access our US based content providers. Alternately, you could see if there's a streaming hardware platform that will give you access to the UK providers you want and that has a VPN app. I know that the Amazon Firestick 4K has an ExpressVPN app available, which also works well. As a bonus, we have a smart TV and connect it directly to our Bouygues wifi (French IP address), so that we can also log onto streaming providers "from France" too. You get the best of both worlds that way.