101 has also been handed an extended role across the Britvic portfolio, including for R. Whites, the lemonade brand.
CHI & Partners, the incumbent agency, repitched against 101 for the business.
Kevin McNair, GB marketing director at Britvic, commented: "Drench is a key brand in our portfolio, and 101 impressed us throughout the process with the passion and ideas they’ve shown for it.
"We’re delighted to extend our relationship to a much broader remit after the great work they’ve been doing for Tango."
The win comes after 101 won the Tango brand in 2014 and subsequently created "the five stages of tang" campaign.
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