Yes I finally did have some BM's in the evening after drinking copious amounts of water! I realise that I wasn't drinking much water at all in the lead up to the flush. I think that was my biggest mistake. But you live and learn.
I did get some sludge out. But I have a 20mm diameter gallstone (diagnosed by an ultrasound) that I'm serious about getting out. So I'm not going to give up.
Yesterday I bought a 15-day detox program for the liver, bowel, stomach and intestines. When I've completed that I'm going to give the flush another go. I'm not defeated yet!! :)