THe most you can currently expect from any TV broadcast anywhere in the world is Dolby Digital+. Dolby Digital 5.1 is the best you'll currently get in the UK.
The only content currently encoded with to lossless HD formats is that found on Blue-ray discs. The bandwidth requirements would be a major hurdle when it comes to using such formats for TV broadcasts.
Who would have though it would take up so much bandwidth, to get good sound, well as long as its 5.1 am happy enough as its not just the picture but the sounds that's important as well, well tis to me anyway
Dolby Digital+ is set to replace standard Dolby Digital and is already an excepted audio standard for TV broadcasts. This will still not be a HD format, but it will be able to carry up to 8 channels of audio for discrete 7.1. DD+ is also capable of a Sample rate of up to 96kHz and a bit rate of up to 6 Mbit/s. Standard Dolby Digital is restricted to 48kHz and a maximum constant bit rate of up to 640kbps.
There's nothing as yet broadcast in the UK that utilises DD+.