My friend Paul (wildlife photographer) is something else. He's raised nearly £500k helping to protect endangered species, particularly tigers. He's run 25 marathons, including Everest, many in his famous tiger suit.

When he shared his plan for a new challenge walking from Tigerton in Scotland to Tiger Bay in Cardiff, 25 marathons in 25 days, I knew I had to step up too. Inspired by the Remembering Tigers event at the RGS last autumn, I've signed up to walk 4 marathons in 4 consecutive days at the end of August - a small way to help Tigers in India at risk from poachers, drought and a reducing habitat.

In 1900, there were over 100,000 tigers, today thats closer to 5,500, and growing, so there's hope. If you're able to spare a small donation (or more) I'd be extremely grateful - so will the tigers. Thank you.