London-based Bimber Distillery has added four wine cask-matured single malts to its Spirit of the Underground Collection.Bimber Spirit of the Underground is a single malt series launched in partnership with Transport for London (TfL), with each bottle featuring a different station of the London Underground. Release No.3 is a batch showcasing stations Camden Town, Canary Wharf, Notting Hill Gate and Tower Hill. Matt McKay, Bimber’s director of marketing and communications, said: “We’re delighted to reveal the next four stations that will be joining The Spirit of the Underground Collection. "For this release we’ve selected four outstanding casks which showcase our ever-broadening selection of flavour profiles. Each of these fortified wine casks has brought both a unique influence and a different perspective to our distinctive London spirit. "And we’re particularly excited to be using Release 3 to unveil three entirely new casks styles that we have added into our growing cask inventory." Release No.3 will join the current collection which comprises bottles representing Waterloo, Baker Street, King's Cross St Pancras and Oxford Circus. The label of each bottle is meant to highlight the significance of each station’s location. The Release No.3 batch has undergone secondary maturation in a different fortified wine casks, with three bottles featuring cask types that have not been previously released by the distillery. Each expression is bottled at cask strength, sitting at strengths ranging from 58.1%-59% ABV. Ellen Sankey, brand licensing manager at TfL, added: “We are delighted to see Bimber Distillery further capture our unique brand with this latest release, which nods to both TfL’s and the capital’s rich heritage. "Innovative collaborations such as this are a great example of how brands can work with us and let their customers have a little bit of London in their home.” The Spirit of the Underground Collection will eventually total 44 individual releases, with each bottle representing a different tube station. All single malts in the collection were produced from the distillery’s single farm barley and malted on a dedicated floor, before being fermented for seven days in American oak washbacks. The Collection is available from today (16 May) until Thursday 19 May from a weighted ballot on Bimber's website, and the bottles each have an RRP of £125 (US$152).