The problem I had with Raymond Blanc's kitchen secrets were contained in the 1st episode - I haven't really watched since, but in that episode the close ups of the food were in indeed HD quality. although there was a lot of dodgy camera work in there with cameras struggling to get focus (hunting) (either the result of autofocus (in which case why was it on auto) or some very poor camera work by the crew). However, the general picture shots in the kitchen were soft and blurry including the close ups of Raymond's face.
As for the Countryfile programme, I would point out that in Lost Land of the Jaguar, the BBC used domestic camcorder sized HD cameras to shoot the programmme in HD throughout even in the densest jungle and although I wouldn't hold this programme up as a shining example of BBC HD at its very best (I do think there are much better examples), it does never the less show that the BBC do have small compact HD cameras at their disposal which really makes any excuse of we couldn't lug large cameras up the mountain a non valid excuse, The bridge report at the bottom also had no camera portability problems but was still terribly soft and blurry.
Also whilst you can pick holes in my methodology of taking photos direct from a screen, these pictures were taken back to back using the same tripod steadied camera, Humax HDR and my THX II calibrated Pioneer 428XD Kuro.
Click the tumbnail to expand (then zoom icon to go larger still):
On the top is BBC HD (possibly Wildest Dreams HD or some other natural history programme - I forget on this one), on the bottom channel 5 SD - megastructures).
Another example: from Wildest Dreams BBC HD vs Channel 5 Megastructures:
And another set:
Admittedly not all BC HD is this bad and some of it is still excellent. It is however very variable depending on the type of content and how well it seems to encode.
However, there is no way that even the very best of SD should better the worst of HD and as you can see above, in some programmes that is exactly what has happened in my opinion.