Taste: Straightforward and exactly what you expect it to be. Presentation: It looks like a regular Sprite can. No one's suspicious of me going about my regular day with a can of this on hand. Price: ...

SWIGGING from her water bottle, Lucy da Silva, then 29, looked like any other London Underground passenger on their way to work at 7am. But actually the young professional, from Hitchin, Herts.