In 1997, Arsenal explored the possibility of relocating to a new stadium, having been denied planning permission by Islington Council to expand its home ground of Highbury. After considering various options (including purchasing Wembley), the club bought an industrial and waste disposal estate in Ashburton Grove in 2000. A year later they won the council's approval to build a stadium on the site; manager Arsène Wenger described this as the "biggest decision in Arsenal's history" since the board appointed Herbert Chapman.[3] Relocation began in 2002, but financial difficulties delayed work until February 2004. Emirates Airline was later announced as the main sponsor for the stadium. Work was completed in 2006 at a cost of £390 million.