I emailed about why its not in HD today and sky replied;
Due to contractual issues this series was a late addition to the Sky Sports schedules. Therefore, for today only, we have to broadcast our studio in 4x3 standard definition (i.e. not widescreen).
We will be back in glorious HD for days 4 and 5.
Day 3 highlights will be in HD at 6pm on SSHD4 and repeated at 10pm on SSHD2.
Many apologies if it is affecting your viewing experience and I hope you are enjoying the coverage.