The Wine Gang - the grouping of five leading wine critics - is offering a subscriber the chance to win a wine tasting holiday in Rioja.
The competition marks the first anniversary of the creation of the Wine Gang's website, which combines the work of Tim Atkin MW, Anthony Rose, Olly Smith, Joanna Simon and Tom Cannavan.
The prize includes a visit to Dinastía Vivanco and its Museum of Wine Culture, with lunch at its restaurant.
One member of the Wine Gang will meet the winner for a tour and tasting, guided by Rafael Vivanco.
Tom Cannavan said: "Just like the original intention of the Wine Gang, this prize will give one lucky subscriber a real opportunity to gain access to an unseen side of the wine world very few experience."