made mine and put in about 14 litres only got 10 litres out of it(5 x 2litre coke bottles)
tried it last week and it was like syrup,really thick,and sweet....good sugar rush though
still got a bottle left in the fridge which doesn't look a thick as the others,put 2kg of sugar in and think this is too much for the mixture,but copied HFW's River cottage recipe,and he only recommended 6 litres of water..his must have been like treacle..
oh well there's always next year,,,,,bring it on