I'm running the London Marathon for Prostate Cancer UK. This will be my first ever marathon, so it's a big big challenge! And I'm so proud to be running on behalf of Prostate Cancer UK team, for both personal and professional reasons. My personal reason? My father died of prostate cancer; like many men he was private about matters of health, reluctant to visit his GP, dismissive of his symptoms, and, I suspect, fearful of opening a can of worms if he went to the doctor's. His prostate cancer was sadly already at an advanced stage by the time he was diagnosed, and he inevitably lost his battle with the disease. My professional reason? I am a GP. I've been witness to a huge change in the diagnosis and treatment of prostate cancer since my early days as a young doctor. Very often the word cancer wasn't used then, the PSA test had not been discovered, the treatment was very rudimentary, and there was little information and support for patients and their relatives. Since then, my goodness, things have changed, and supporting and funding this change has been charities. The work of Prostate Cancer UK has been so valuable in so many ways: promoting, educating, supporting, demystifying, funding research, providing information through its website and helplines. To run the London Marathon in memory of my father while at the same time supporting and promoting Prostate Cancer UK's great work is such a privilege, and so very special.