You know that annoying person in your life who pops up just once a year to ask you to support him in some physical challenge to help raise money for an important cause? He's either running a marathon or climbing a mountain but whatever it is, it's all for a good cause.

Trouble is, when he first asked you, you were impressed. The thought of his running a marathon was positively laughable. Until he actually did it. Then did it again. Then switched to night time walking marathons and is now about to complete his sixth one.

Yes, you do know that bloke, because you wouldn't be on this page if you didn't. Once again it's time to take to the streets of London for 26 miles and 385 yards. We start at 10.15pm and come in along the bank of the Thames as the sun comes up, and it's all the sweeter when I know my efforts are helping us get that one stage closer to beating cancer for good.

So please, dig deep - or shallow - whatever works for you, and let's make a difference together.

Thank you.