Holden based the idea on a groundsman's lodge at Midhurst Sanatorium designed by Adams, Holden, and Pearson in 1904–1906. The centre of the ticket hall is occupied by a disused ticket office (a passimeter in London Underground parlance) which houses an exhibition on the station and the line. The original design by Holden was detailed by Charles Hutton, who also had to amend the construction method from Sudbury Town tube station due to issues with leaking shuttering for the concrete roof discolouring the brickwork. The station today Three parallel train tracks pass through the station, with two double-sided platforms between the central track and the outer tracks. The edges of the platforms are labelled platform 1 and 2, and platform 3 and 4, in such a way that the two outer tracks are accessible from platforms 1 and 4, and the central track, usually used by trains that terminate and reverse at Arnos Grove station, is accessible from platforms 2 and 3. Platforms 1 and 2 are designated for trains to Cockfosters while platforms 3 and 4 are for trains to Central London. When operating a shuttle service between Arnos Grove and Cockfosters, the central track is used exclusively as it has access to both running tracks to/from Southgate (the outer tracks don't have this access). In July 2011 Arnos Grove became a Grade II* listed building. The building is one of the 12 "Great Modern Buildings" profiled in The Guardian during October 2007. Arnos Grove Drivers' Depot won Best Newcomer and Best Overall Garden in the Underground in Bloom 2011 competition for their new project which also got them an award in the London in Bloom competition. Their website tells the whole story with photographs of the garden and the awards ceremonies. Station improvements In 2005 the station underwent a refurbishment programme including improvements to signage, security and train information systems. General repairs and redecoration were carried out, flooring was renewed, and better lighting, an improved CCTV security system and Help Points were installed, with the latter being suitable for people with limited hearing. Some of the original signs are in a 'petit-serif' adaptation of the London Underground typeface, Johnston Delf Smith Sans. This typeface was designed by Charles Holden and Percy Delf Smith, a former pupil of Edward Johnston. During the refurbishment programme, all these heritage features were maintained as well: The circular 'Sudbury box' red brick building