Beginner
Stansted has CAT 3 facilities.
OCA(H) = Obstacle Clearance Altitude (Height) - ie altitude refers to QNH, height to QFE. Basically the altitude (height) at which you will clear all obstacles within the approach path / go around area. The area the obstacles which are considered are in varies with the type of approach being flown - bigger area with non-precision approaches as the accuracy of the flight path is less than with an ILS, for example.