Question: From when the British pub chain is owning the Flask public house who also operates nearly 220 pubs?

full_context: Document 1: Young's: Young's (Young & Co.'s Brewery Plc) is a British pub chain operating nearly 220 pubs.
Document 2: Prospect of Whitby: The Prospect of Whitby is a historic public house on the banks of the Thames at Wapping in the London Borough of Tower Hamlets. It lays claim to being the site of the oldest riverside tavern, dating from around 1520.
Document 3: The Flask, Highgate: The Flask is a Grade II listed public house at 74–76 Highgate West Hill, Highgate, London. According to the 1936 "Survey of London", a pub known as The Flask has stood on this spot since "at least as early as 1663". The present buildings probably date from the early 18th century, and were partially rebuilt in about 1767 by William Carpenter. A Manorial court met there in the eighteenth century. The Flask is currently owned and operated by the London-based Fuller's Brewery.
Document 4: List of breweries in Pennsylvania: This is a partial list of breweries in Pennsylvania. In 2017 there are 300 licensed craft breweries in Pennsylvania. Only the notable ones are listed here. One of these breweries is America's longest established, D.G. Yuengling & Son. Yuengling is also the largest craft brewery in the country based on volume of sales . Other nationally known brands that are made in Pennsylvania include Victory Brewing Company's Hop Devil and Weyerbacher's Merry Monks. Some of these breweries also feature a restaurant or snack bar at their breweries. Brewpubs in Pennsylvania do not distribute their products beyond the premises.
Document 5: Yates's: Yates is a British pub chain, founded as Yates Wine Lodge in Oldham, Lancashire by Peter and Simon Yates in 1884. The chain remained strongest in the North of England, though spreading nationwide.
Document 6: The Flask, Hampstead: The Flask is a Grade II listed public house at 14 Flask Walk, Hampstead, London, on the site from where the trade in Hampstead mineral water was run, and which is mentioned in the eighteenth century novel "Clarissa". It has been owned by Young's Brewery since 1904.
Document 7: J.W. Lees Brewery: J.W. Lees is a brewery in Middleton, Greater Manchester, that has produced real ale since 1828. The brewery owns and operates 140 pubs, mainly in North West England and North Wales. It also owns wine distributor Willoughby's.
Document 8: Pub chain: A pub chain is a group of pubs or bars with a brand image. The brand may be owned outright by one company, or there may be multiple financiers; the chain may be a division within a larger company, or may be a single operation. Examples include Chef & Brewer, Wetherspoons, Walkabout, Taylor Walker Pubs and All Bar One. Pubs in the chain are typically branded with the same name, however the former "Firkin" pubs tended to be variations on a theme including the word Firkin in the title. Wetherspoons pubs have individual names, with the Wetherspoons brand prominently displayed.
Document 9: Ye Olde Cheshire Cheese: Ye Olde Cheshire Cheese is a Grade II listed public house at 145 Fleet Street, on Wine Office Court, City of London.
Document 10: Millbank Distillery: Millbank Distillery was a London gin distillery owned and operated by Seager Evans and Co.. It was located on Grosvenor Road on the North bank of the River Thames in Pimlico. The company's best known product, Seagers Gin, was produced here up until the early 20th century. Millbank Distillery is often confused with Thames Bank Distillery a slightly older distillery, founded in 1797 and located further west along the river. Thames Bank Distillery was owned by Octavius Smith & Company - it was located on Grosvenor Road - its rear boundary was Lupus Street and on either side of it were Glasgow Terrace and Turpentine Lane.
Document 11: Brains Brewery: Brains (S. A. Brain & Company Ltd) is a regional brewery founded in 1882 in Cardiff, Wales, by Samuel Arthur Brain. The company controls more than 250 pubs in South Wales (particularly in Cardiff), Mid Wales and the West Country. The company took over Crown Buckley brewery in Llanelli in 1997, and Hancock's Brewery in 1999. Brains moved to the former Hancock's brewery just south of Cardiff Central railway station in 2000. The Old Brewery, in Cardiff city centre, has been developed into a modern bar and restaurant complex.
Document 12: Silver Spring Soft Drinks: Silver Spring Soft Drinks Ltd was a commercial limited company that produced a range of soft drinks from its factory and headquarters at Folkestone, Kent, in the United Kingdom. Founded as a company in 1886, the company traded under the name of Silver Spring Mineral Water Company until it changed ownership in 2009; it was subsequently sold by Privet Capital in 2010. The new entity in turn hit trouble in 2012 and was liquidated in early 2013. It produced the drink brands Perfectly Clear and Rola Cola along with own label brands for supermarket chains.
Document 13: Princess Louise, Holborn: The Princess Louise is a public house situated on High Holborn, a street in central London. Built in 1872, it is best known for its well-preserved 1891 Victorian interior, with wood panelling and a series of booths around an island bar. It is a tied house owned by the Samuel Smith Brewery of Tadcaster, Yorkshire.
Document 14: Stewart's Fountain Classics: Stewart's Fountain Classics are a brand of premium soft drinks made in the United States. Stewart's are nostalgic "old fashioned" fountain sodas, having originated at the Stewart's Restaurants, a chain of root beer stands started in 1924 by Frank Stewart in Mansfield, Ohio. In 1990, the bottling rights to Stewart's were acquired by the Cable Car Beverage Corporation. Cream Soda and Ginger Beer flavors were introduced in 1992. Other flavors have been added since then. Cable Car Beverage Corporation, in November 1997, was purchased by Triarc. Cadbury Schweppes PLC acquired the Stewart's brands in 2000 along with Snapple and Mistic Brands for $1.45 billion.
Document 15: Sizzling Pubs: Sizzling Pubs, also known as Sizzling Pub Company, is a British chain of pub restaurants, owned by Mitchells & Butlers (former Bass), that operates mainly as a steakhouse. After Vintage Inns, it is M&B's most populous pub chain.
ground_truth: 1904