The two flavours are Pink Rhubarb and Oriental Yuzu.

Rhubarb is in vogue at the moment, as a standalone ingredient and a flavour in premium spirits, said Fentimans marketing director, Andrew Jackson. While the Yuzu Tonic was developed to paired with contemporary and new wave gins.

"Since the launch of our pioneering Pink Grapefruit Tonic Water, we are seeing an increasing number of consumers experimenting with different flavour combinations," said Andrew.

"The roll out of rhubarb and yuzu flavoured tonic provides this growing audience with increased flavour options; that can make every day classic spirits taste even better."