I will be holidaying in the U.K. and Ireland later in the year, and if I can organise it properly, I should stumble across a motor racing circuit on the day a motor racing event is being held (I didn't know honey, honest!

The question is, a lot of circuits are visible only through high catch fencing these days (stupid OH&S), which makes photographs difficult to take.
So which circuits are spectator friendly in this regard? It doesn't matter how big or small the event is.