TV Highlights Wednesday
Reality Bites: Donal Walsh -- My Story
RTE Two, 9.30pm
By the time Donal Walsh (right) had died of cancer last May at the age of just 16, he'd inspired an entire nation. This documentary celebrates the Kerryman's life, his campaign against teen suicide and his moving appearance on the 'Saturday Night Show'.Live Channel 4 Racing
Channel 4, 1.05pm
Nick Luck is at Cheltenham to cover the New Year's Day meet, plus races from Prestbury Park and the Musselburgh course, Scotland. With commentary and analysis from Jim McGrath and Simon Holt (right).David Attenborough's Natural History Museum
David (right) takes a tour of London's Natural History Museum, and uses the latest technology to bring exhibits to life, revealing what dodos actually looked like.Sherlock
Dr John Watson has recovered from the shocking events of last season and is getting on in his life when his friend returns. But there's no time for catching up, because Holmes (Benedict Cumberbatch, right ) has heard of a terrorist plot.