All TVs sold in the UK *should* be able to do both 50Hz and 60Hz. I bought a new TV (£399 Samsung 39" LCD with LED backlighting, can't remember the model number) about a year ago. As long as I connect via HDMI, it can handle 25/50 Hz, 30/60Hz, and 24Hz at 1920x1080, and other frequecies at lower resolutions. Information is difficult to find on reseller websites, but Samsung lists the supported refresh rates/resolutions in the back of the user manuals, which you can find on the Samsung website.
Edit: what she said ^
Edit: what she said ^