I've weighed up the HDR thing and on balance it's not that important, well not enough for an extra £300! I'm also hoping the YSP (Yamaha Sound Projector) sounds a little better for music than the average soundbar.
I've come up with what I think is a reasonable setup for £1250 from Richersounds.
MDA TUCANA 1200 HYBRID TV Bench £250
HISENSE 55M3300 55" 4K TV £550
Yamaha YSP 2500 Soundbar £450
The TV bench is the best I could find that will hide my AV stuff behind Glass Doors and raise the TV enough to put a Soundbar under without being in front, the oak version goes with the rest of my furniture. Both the TV and YSP get very good reviews across the Internet so I'm pretty confident they'll be OK.
If I wanted to go up a level to HDR it's going to cost me an extra £400 (650 TV & 800 YSP 2700) which I'm struggling to justify when 1080p on my old 50" LG plasma still impresses me!