The soft drinks giant, which has been losing share recently to arch-rival Pepsi, launched a 'lemon-tinged' Diet Coke in the US last year to take on Pepsi Twist, a lemon-flavoured Pepsi drink.
However, the British variant has been formulated for a much stronger lemon flavour than its US counterpart.
The design for the new drink was created by Dew Gibbons Design.
Launched in 1982, Diet Coke has proven a major success for Coke. But the firm has since had its share of disastrous attempts at innovation, including the 1985 introduction of Cherry Coke and New Coke, the sugary new formula that had to be abandoned following a popular outcry.
A Coca-Cola spokeswoman said the company had no plans to launch a vanilla Coke variant in the UK and could not confirm that the drink was in development for the US market.
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