The Darwin Brewery in Sunderland has teamed up with Barracuda Group to launch personalised house cask ale in bars across the North East of England. The cask-conditioned beer, initially developed for and introduced to Barracuda's Ivy House pub on Wearside, where it is called "Ivy Evolution" is already proving popular with customers. It has an ABV of 4% and comes with personalised pump clips, which add to its unique identity. After the successful take up at the Ivy House, Barracuda's Chesters and Grey Horse pubs in Sunderland have started selling their own versions. Mark McQuater, Barracuda's chief executive, said: "Many of our 30 pubs in the North East were former Vaux houses, so continuing our link with local brewing is all the more poignant." The Darwin Brewery's Steve Proudfoot said: "It's the first time we have supplied to a national operator like Barracuda and that in itself is a significant achievement for us. It's refreshing to see a big company willing to use smaller independent breweries like us. "The Grey Horse had 16 casks delivered during Christmas week making it our biggest customer over the festive period."