Tom,
I want to let you know how much I love you as Doctor Who. Growing up in the States I use to watch you on our local PBS station each week with my dad. Recently I have purchased many of your serials on DVD and love the stories as they bring me back to the days of my youth, but I also enjoy listening to your commentary and insight on each episode. Thank you for all you've done and currently do.
My question to you is about the Five Doctors special: I am curious why you didn't participate in the special? Keep in mind I don't have all the information and details of why you weren't in this special. My reason for why I ask this question is because as a child I was devastated when you left as The Doctor and I looked forward to seeing you in the role again, and was saddened that you didn't have big part in the story.
Thanks for everything Tom!
Brett