be staged at Sheffield Wednesday's Hillsborough Stadium. In light of this United's former chief executive, Trevor Birch, made it known that all planned ground redevelopment had been put on hold until the club was able to regain and maintain Premiership status. A revised application for the redevelopment of Kop was submitted in 2015, which would see 3,215 seats added to the stand's current capacity. Further plans were revealed in 2017 for the development of the corner between the Kop and South Stand, which would see the construction of residential flats and a new club store. Supporters and rivalries Sheffield United derive support from a broad cross-section of the city and its environs, with branches of the official supporters' club running from Swinton, Kiveton Park, Retford and Eckington. Further afield, supporters groups also exist in Essex, the Republic of Ireland, the Netherlands and Australia, amongst others. A 2013 study of posts on social networking site Twitter found that Blades fans have the most positive interactions with the official account of their club out of any in English football. Sheffield United were also found to have the most 'obsessed' fans in the 2006–07 Premier League, with supporters reportedly thinking about the team 110 times a day on average. United have a number of celebrity supporters including: Sean Bean, actor Kell Brook, boxer Richard Caborn, Labour Party politician Joe Elliott, singer-songwriter and musician Jessica Ennis-Hill, Olympic gold-medallist Flea, singer and actor Matt Fitzpatrick, golfer Mick Foley, author, actor and former professional wrestler Paul Goodison, Olympic gold-medallist Paul Heaton, musician Ding Junhui, professional snooker player Mark Labbett, Chaser on TV quiz show The Chase Michael Palin, writer and television presenter Joe Root, England cricketer Juan Sebastián Verón, former Argentina international footballer Rivalries Sheffield United have numerous rivalries, mostly with other Yorkshire clubs. The most notable rivalry is with their city neighbours Sheffield Wednesday, with whom they contest the Steel City derby (named after the steel industry for which the city of Sheffield is globally famous). Sheffield United's next main rival is Leeds United from West Yorkshire. This is known as a Yorkshire derby match (the two cities of Sheffield and Leeds are the largest two cities in Yorkshire). Their other main rivals are the professional clubs of South Yorkshire; Barnsley, Doncaster Rovers and Rotherham United. These matches are known as South Yorkshire derbies. Sheffield United also have a rivalry with Nottingham Forest. This can