1) NTSC/PAL ceased to mean anything much when the CRT died - every flatscreen is progressive and supports all frame rates. PCs/media centres, etc, etc ONLY support progressive. So interlaced footage is only notionally supported as a transmitted stream which must then be deinterlaced either by the source (PC, etc) or destination (the plasma/LCD)
2) any DVD writer or player in the last 10 years will playback oldie worldie SD resolution PAL or NTSC footage if you insist on burning it. if its a UK player - you just need to set the region to UK - nothing to stop you still burning NTSC MPEG2 footage.
3) In HD, there is no such thing as 'NTSC' - there are various different frame rates, all supported by all HD tvs - 1080p30 is not 'HD NTSC'.. it is just 1080p30 - it is as valid as 1080p24 or 1080p25.. ah well except there is in fact, no such standard, only 1080p24 - why ? because it would be bloody stupid - the only reason there is a different frame rate between PAL and NTSC is the difference in vertical lines count - hence the extra bandwidth on NTSC being available for more fps.
NTSC DVD SD: 720x480, 29.97fps
PAL DVD SD: 720x576, 29.97fps
e.g: PAL has more definition, but has less temportal information. i.e. NTSC is not 'worse'... a common mistake people make - for fast moving scenes it may be significantly better....
this difference in vertical line count was due to the ANALOGUE NTSC vs PAL standards.
It ceased to mean much at all when we went digital, and ceased to mean anything at all when we went to HD...
so in HD there is:
720p (1280x720) and 1080p(1920x1080)
thats it! not a different size for UK and USA.
There are various different frame rates in the standard - these are there to support various different content types and are various trade offs between resolution integrity vs temportal data for a given framerate.
They have precisely FA to do with countries, or NTSC/PAL.
In reality, the artificial 720p25 and 1080i50 that were put into the standard were very much transients to support upscaling of SD content. They have FA other reason to exist. I can't think of a single device that shoots 720p25, and 1080i50 is hanging on only in the HDCAM/AVCHD standards and is rapidly losing favour to progressive - I'd expect it to disappear in the next few years to be replaced by progressive p30 and p60 as we are already seeing in cameras such as the EOS series.
In reality, the vast majority of HD currently is in 30p, 24p (movies), and 60i (sport).
Let NTSC and PAL die a death please.