I've started playing with the YUV values. While trying to find a solution for Series 11's turgid yellow color scheme, the RGB filters weren't doing much good.

Not perfect, but closer in appearance to the more natural-looking promotional photos. This was made in 2008 and promoted as the introduction of HD, there's no excuse for why this went to air looking so terrible! If the writing's going to get more and more pedantic, it should at least be pleasant to look at...

I've made some similar adjustments for Series 4, looking great in some shots, but with kind of a cyan tint in others.