You mentioned that it's not all glamour all the time in sports photography. What should newcomers watch out for?
You need to be resilient and robust. The equipment is heavy, the working conditions for outdoor sports are often wet and cold, you are almost certainly on your own and the schedules are relentless. When you are younger you can get used to practically anything, give or take, but it's a bit like yomping through the Brecon Beacons to try and join a crack regiment – if you can't hack the physical side of the job, the rest will never fit into place.
What are the elements of the perfect action shot?
A top player always helps. A shot of Rafa Nadal will always sell more than one of an unknown tennis player, that's just the way it is. After that, it can be one of two things: the capturing of a beautiful action moment, especially something that's never revealed to the naked eye. Or a moment of pure honesty shining through in a person's face and body language, be it triumph or disaster.
Do you need to understand all the rules of a sport to cover it?
Well I guess not. Simply observing a sport entirely afresh would be an interesting exercise and might lead to taking some images that the more experienced pros would not even consider.