Lyle's has signalled its intent to stick with Coffee Syrups by announcing a £450,000 round of support.
The push will include offering London consumers a free sample sachet and money-off coupon if they send a text message for details.
Flagged up on poster sites across the London Underground network, the campaign is also being highlighted through advertising trails on the capital's Jazz FM and Heart FM radio stations.
Lyle's claims the the campaign, which finishes in mid-November, will reach around eight million consumers.