It seems the new US releases are still the definitive ones. There are a few things on them, like the reinstatement of the 'Next Time' trailers in Series 5 and the inclusion of the actual broadcast version of the 2005 children in need special rather than the workprint version that was mistakenly included on the DVDs, which have plagued all home releases until now -- including
the current UK Blu Rays!
It's somewhat bizarre that Series 1-4 actually differ between UK and US. My assumption was both would be from the same source (blu rays being a mostly universal format, unlike DVD).