Little Britain comedian and charity fundraiser Walliams carried the flame at around 8.30am outside Islington Town Hall, as it made its way towards St Paul's Cathedral.
I felt really humbled to be a part of it. This torch and this flame is bigger than anybody out there and there's something about the spirit and I really got a sense of that running along. "You can't really get lost on Upper Street and I had a wonderful response. I was thrilled to be asked to do it, especially so near to the Olympics starting.
The 40-year-old, whose fundraising feats include swimming the English Channel, the River Thames and the Straits of Gibraltar, added:
It was fantastic to be a part of it, I've been looking forward to it for ages. You get to keep the tracksuit, which is the most important thing. You have to buy the torch. There was a lovely response and I know I'm only a small part of it but it felt very special. I'm not a natural jogger, let alone runner, but it's only 300 metres so I did manage it. I started off walking, then I went into a jog, then I thought I would show off and started running and then it was all over. I'm glad it wasn't much further.