A forward slip and side slip are two different maneuvers, though both are cross controlled with respect to rudder and aileron inputs.

The forward slip maintains the same ground path, with the heading of the airplane off axis to that path. These are great fun in full sized airplanes, especially when the wind is to the right side of the nose. Mostly used to drop a great deal of altitude without the use of flaps

The side slip is using aileron to bank into a cross wind, and the rudder is used to hold the heading of the aircraft the same direction as the flight path. With a GA high wing airplane, you can do this right down to the runway, touching down on the up wind wheel first. If you are really skilled, you can add power and stay on just that wheel for some distance.

What terms they use in England doesn't matter too much in the States, except when trying to understand what they are talking about. What is a bunt?