Just made Abdul Mohmeds base from his book along with the enhanced gravy stage listed on the forum, but it's not an isolated incident - have had this with c2g base too from time to time.
Water seems to leak from the final curry (abduls madras in this case), I'm not sure why or what I can do to stop it. Following his instructions to the letter, I added more base (1 pint) than I normally would (approx 300ml) to a meal and reduced down to a reasonably thick sauce. As I mentioned I've had this happen before with other bases so it's probably down to a failing in my technique
A picture may help to explain