Actually, I had not seen a large tree felled by sawing on the side to which it was intended to fall. Down here in the states, we usually make a notch and then make a felling cut on the side opposite the hoped for direction of fall. There is some disagreement on whether the felling cut should be horizontal or at a downward angle to the notch. The major problem with cutting on the side that the tree will fall towards is that a little movement of the tree may grab the saw. Then, unless you have another saw, you are stuck.
John