Don't waste your money on UHD
UHD uses up a lot of bandwidth,whether delivered on cable,satellite or terrestrial UHF.For that reason don't expect any broadcasters to offer it any time soon.
The trend in my neck of the woods (not UK) is for broadcasters to actually decrease bitrates (resolution) because they keep on adding new channels to their bouquets,usually shopping type channels.
Spectrum is now an expensive commodity,and the broadcasters want to jam in as many channels as they can to maximise their returns.