I too used the River Cottage recipe for the 1st time last Nov after stumbling onto some bushes near by. Mine turned out very successful and I only added the tiniest touch of yeast to each batch. This still managed to produce the most awesome fizzy champs. My work collegues were very impressed with tasters before Christmas so we are all looking out for more bushes for future raidings.
Have successfully managed to strike cuttings, so don't expect any harvest soon.