This is a good kit but care is needed in selecting the correct doughnut washer. I initially used the rounded one and it leaked. It took a bit of detective work because I first thought one of the cistern screws was leaking until I removed the cistern and left it standing full of water. There was, however, water on top of the pan around the flush opening.
After determining the fixings were good, I refitted the cistern using the flat doughnut. No further leakage.
The quality of the product is very good, this is essential when fitting a close coupled toilet knowing that it will do the job and avoid having to re-do the work if it isn't.
The price belies the quality and may put people off using the items.