Which? measured the caffeine in drinks at five big coffee chains and found 'huge differences'.
"Our research shows you may be consuming significantly more, or less, caffeine than you bargained for," said its nutritionist Shefalee Loth.
Guppy Bahtoye, 37, from Wolverhampton told the BBC: "I like my coffee - in fact, I travel that extra bit just go to Costa because I like the way they make their lattes. For example, Costa's cappuccino was strongest, with caffeine equivalent to four cups of tea, while Starbucks' contained the least at 66mg - less than a single cup of tea.
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