Are there really people gullible to buy some sachets of 'magic yeast' for £13.99 !!! Surely it would be cheaper to just buy a bottle of vodka to add to you juice.
Depends on what you call a sachet I guess...it does state that there's enough to treat 1.6 litres (x 6 sachets). so I guess this is 2 galls worth. (or 1/2-ish of a sachet we would buy).
I reckon it's all worth about £3, depending on the quality of the bubbler...