I go through Betfair, I'm not sure about lads or wills but Betfair has in-play/live betting. Sky seems to close/end early in the race.
Strategy is mainly technical, I find the fundamental side too "noisey". I don't look at volume but I'm sure you could come up with a system for that, for me it's timing that's my advantage. I mainly focus on Formula 1 now and hardly touch the other sports.