Question: Who founded the famous chain of music-themed restaurants which opened its first establishment in the city where the Royal Mint was located prior to moving to Wales?

London has numerous venues for rock and pop concerts, including the world's busiest arena the o2 arena and other large arenas such as Earls Court, Wembley Arena, as well as many mid-sized venues, such as Brixton Academy, the Hammersmith Apollo and the Shepherd's Bush Empire. Several music festivals, including the Wireless Festival, South West Four, Lovebox, and Hyde Park's British Summer Time are all held in London. In the 1960s, 1970s and 1980s, musicians and groups like Elton John, Pink Floyd, David Bowie, Queen, The Kinks, The Rolling Stones, The Who, Eric Clapton, Led Zeppelin, The Small Faces, Iron Maiden, Fleetwood Mac, Elvis Costello, Cat Stevens, The Police, The Cure, Madness, The Jam, Dusty Springfield, Phil Collins, Rod Stewart and Sade, derived their sound from the streets and rhythms vibrating through London. The city is home to the first and original Hard Rock Cafe and the Abbey Road Studios where The Beatles recorded many of their hits. <SEP> work on the new mint began in august 1967 with the construction of a blank treatment plant and plant for striking. this first phase of the mint was officially opened on 17 december 1968 by the royal attendance of queen elizabeth ii, prince philip and their son prince charles. originally there were fears that the royal family would face protests because of the investiture of prince charles as the prince of wales; however, such protests failed to materialise. the second phase of construction began in 1973 and included the addition of a means to mint coins from virgin metals completing the full minting process. upon completion the final cost for the land, buildings and plant came to £8 million. coin minting and production gradually shifted to the new site over the next seven years until the last coin, a gold sovereign, was struck in london in november 1975. in an attempt to consolidate all previous coin - related acts, the coinage act of 1971 was passed, which among other things effectively abolished the individual role of master of the mint. under this act, the chancellor of the exchequer took over the role, with a deputy master being appointed by the treasury to exercise all the powers and duties of the master within the mint. <SEP> the first issue (1966) was produced by three mints: 146.5 million were minted at the royal australian mint in canberra, with 239 million at the melbourne mint and 26.6 million at the perth mint. with the exception of 1966 and 1981, all other one - cent coins have been produced at the canberra mint. in 1981, 40.3 million were struck at the british royal mint in llantrisant, wales, as well as 183.6 million in canberra. the only year when it was not minted during its years in general circulation was 1986. it was last minted in 1990. <SEP> The Royal Mint is a government - owned mint that produces coins for the United Kingdom. Operating under the name Royal Mint Ltd, the mint is a limited company that is wholly owned by Her Majesty's Treasury and is under an exclusive contract to supply all the nation's coinage. As well as minting circulating coins for use domestically and internationally, the mint also produces planchets, commemorative coins, various types of medals and precious metal bullion. The mint exports to an average of 60 countries a year, making up 70% of its total sales. Formed over 1,100 years ago, the mint was historically part of a series of mints that became centralised to produce coins for the Kingdom of England, all of Great Britain and eventually most of the British Empire. As Britain followed the rest of the world in decimalising its currency, the Mint moved from London to a new 38 acres (15 ha) plant in Llantrisant, Wales where it has remained since. The original London mint from which the Royal Mint is the successor, was established in 886 AD and operated within the Tower of London for approximately 800 years before moving to what is now called Royal Mint Court where it remained until the 1960s. <SEP> The restaurant combined rock music, memorabilia related to rock 'n' roll and American cuisine. On June 14, 1971 he and Peter Morton started the first Hard Rock Café (HRC) restaurant in London's fashionable Mayfair district.