The battle between Coca-Cola's Fanta and Britvic's Tango in the important UK market is set to hot up with the news that Coke is planning to extend the Fanta brand to include the Lemon variety.

The launch of the flavour, which is Fanta's second best selling flavour worldwide, is planned for early next summer, according to UK magazine Marketing..

So far Coca-Cola has refused to confirm that the brand is to be launched in the UK and the ad agency that recently won the Fanta account, Soul, said it was unaware of the plans.

However, Coke has confirmed that Fanta is to be made a priority brand next year with an increase in spend to £5.5m, up £1m.

The brand extension is sure to add to the battle between Tango and Fanta. Tango at present is the bigger brand worth £88m but suffered a decline of 5.5% on last year, according to AC Nielsen figures. Meanwhile Fanta was the faster growing of the two, worth £57m, an increase in value of 22.3%.