ON your marks, get set, go! The big day has finally arrived for thousands of competitors who will run, jog or walk down The Avenue in Southampton today for Sport Relief.

Big Brother's Kate Lawler and Radio One DJ Scott Mills will be on the starting line at 1pm, as the tree-lined road will be sealed off to cars and reserved for runners.

More than 5,000 people are expected to be on the starting line after the mass organised Fitness First warm-up.

Other attractions will include Southampton's Dhol drummers and a demonstration from Wu Tan Martial Arts on Southamp-ton Common.

All money raised will go towards sporting projects in the UK and tackling world poverty.