In 2003, Dimmock competed in the Macmillan 4x4 UK Challenge charity event, raising the profile of the event considerably, which has gone on to raise over £100,000 each year for Macmillan Cancer Support.
Harold Macmillan | Challenge Cup | Macmillan Publishers | Palgrave Macmillan | Challenge Tour | Macmillan | Challenge Anneka | University Challenge | Millennium Challenge Corporation | Diamond Challenge Sculls | USA Pro Cycling Challenge | James MacMillan | Challenge | The Great Indian Laughter Challenge | Macmillan Cancer Support | MacMillan Bloedel | Infinite Challenge | Donald Baxter MacMillan | Alexander Macmillan, 2nd Earl of Stockton | WRU Challenge Cup | World Club Challenge | Sa Re Ga Ma Pa Challenge 2005 | Real World/Road Rules Challenge: Fresh Meat | Grand Challenge Cup | Fletcher Challenge | FIRST Tech Challenge | Extra Challenge | Ultimate Poker Challenge | The Man and the Challenge | Rachel's Challenge |