Just Import?
Plenty of dumb TVs from Sharp over here in Malaysia. And because we're a commonwealth, our TVs are guaranteed to work in the UK, right down to the DVB-T2 tuners and the 230v 50Hz current. They all also come with a world-multi analog video input just in case you need to use a old Japanese games console. Just be mindful that they may cost a pretty penny tho- the 32 incher I picked up last fortnight cost me a good chunk of my salary, and isn't even 1080p.
PS: I think the main reason they don't make "dumb" TVs in the UK anymore is because of Auntie Beeb's Red Button requirements?