@cook @philcolbourn so I just started 2 more batches. Due to open on Christmas eve. I did them with 150g and 200g of sugar. But a couple of things I noticed.
1. Not all the sugar dissolves. I might give it 5 and give it another big shake.
2. A lot of left over juice.
Next time I'm thinking I'll split 2 bottles into 3, so 2/3rd juice in each. Dissolve the sugar in boiling water. Then top up.