Two years ago a new operation for urinary leakage was launched in the United Kingdom (UK). This is a smaller operation than those previously available and more suitable for the frail and elderly. We, the researchers at South Glasgow University Hospital, have been using this operation for 18 months with good success. Several versions however are now on the market, some much more expensive than the original, and perhaps not as good. We need to know which one is best and hence we intend to do a study to find out.