They're on their way!

Early start to wave off our friends S and D on their Gridlocked Scotland challenge. Hitting 40 has inspired these guys to travel the entire length of Scotland in a straight line using only human power.

They sim to walk, cycle, swim and kayak without leaving adjacent grid squares which are one kilometre wide. They started touching The Solway Firth and aim to finish 19 days later at Red Point on The Pentlandite Firth.

Here they are snapped with support team S's mum C and his son C .... Good luck guys. An amazing challenge

If you feel inclined to donate to their charities or want to just follow their progress check out their Facebook Facebookor twitter feeds twitter