Finding your image;
Go to the relevant year. Choose the relevant section, British Eventing in British Eventing, Hunts, Hunt affiliated Combined Training and Hunt Affiliated Hunter Trials in Hunts, most other things under Riding Club NSEA under Arena Eventing.
If there is more than 1 camera, then camera identification usually is: S = showjumping, W= water, X = xc. Y and or Z also = another xc camera