It overtakes Treasury Wine Estate’s Australian brand Wolf Blass, whose Cabernet Sauvignon experienced a 15% sales decline to fall into second place.
Concha y Toro also now has the UK’s bestselling Pinot Noir with Cono Sur Bicicleta and top Malbec through Trivento.
Annual Casillero del Diablo sales now stand at £29.4 million, up from £18.3 million a year ago, while Wolf Blass dropped from £19.9 million to £16.8 million, according to IRI.
CyT Marketing Director Clare Griffiths said: “We will continue to build the brand in the UK market with our customers and consumers by having award winning marketing campaigns and consistent quality wines.
“I have no doubt that our latest major TV sponsorship with Sky Movies coupled with extensive in-store activation will continue to drive further brand growth, category value and overall household penetration.”