I am doing this year for the British Red Cross. With all the help they have given the recent plight of the Japanese and New Zealand Earthquake victims, they are one of the most supportive charities on this planet.
These events cost money and money out of my very own little pockets !!
You can click on my sponsorship link www.justgiving.com/iamtombirdAmazon
Please see below clip on some of the good the Red Cross are involved in:
No Limits, No worries... 
Hi Tom
Your folks told me about this awesome adventure / challenge of yours ! Seriously impressed and hopefully can get you on The Travel Channel to talk about when finished. We have a new studio programme launching on 7th Jan. Will sponsor you via your just giving site.
Wishing you lots of luck and success
Best
Petra
(Mary Rose’s friend !)