Question: What company services Croydon and operated the Thameslink Great Northern franchise?

Context articles: First Capital Connect
Economy of the London Borough of Croydon
West Anglia Great Northern
Thameslink, Southern and Great Northern franchise
Southern (Govia Thameslink Railway)
Network SouthCentral
Association of British Commuters
Gatwick Express
Thameslink and Great Northern
Govia Thameslink Railway

First Capital Connect (FCC) was a British train operating company, owned by FirstGroup, that operated the Thameslink Great Northern franchise from April 2006 to September 2014.
Croydon, located in Greater London, England, has a diverse economy with the service and retail sectors now dominating over the town's historical market status.
 It is today served well by its extensive rail network centering on East and West Croydon stations, from where London Overground, First Capital Connect and Southern operate to most parts of Greater London, Surrey, Sussex, Hampshire and the East of England.
 With the A23, M23 and M25 orbital motorway intersecting Croydon to the South East, it is the principal gateway of the motorway network from the East Sussex area of the South Coast.
 London Gatwick Airport is located to the direct south of the town and has scheduled flights to destinations within Europe, North America and Asia, although has tough competition from the even bigger London Heathrow Airport to the west but has managed to stay the UK's second busiest airport.
 The town has since 2000 had a tram network which has been highly successful, carrying more than 24 million passengers a year.
 The network has four lines with destinations including New Addington to Wimbledon, Beckenham to West Croydon, Elmers End to Therapia Lane, and Elmers End to West Croydon.
 Croydon is one of only five London boroughs not to have any form of London Underground services.
West Anglia Great Northern was a train operating company in England owned by National Express, that operated the West Anglia Great Northern franchise from January 1997 until March 2004 and the Great Northern franchise from April 2004 until March 2006.
Thameslink, Southern and Great Northern (TSGN) is a management contract for the provision of passenger services on the Thameslink and Great Northern routes to Bedford , Luton , Peterborough , King's Lynn , Cambridge , London King's Cross , London Moorgate, Sutton, Wimbledon and Brighton, as well as the whole Southern network (including the Gatwick Express) and the jointly operated First Capital Connect Southeastern services (for example the Kentish Town - Sevenoaks via Catford ), which were added to the franchise on 25 July 2015, with the Southern and Gatwick Express brands retained.
Southern is the brand name used by the Govia Thameslink Railway (GTR) train operating company on the Southern routes of the Thameslink, Southern and Great Northern franchise in England.
 It is a subsidiary of Govia, a joint venture between transport groups Go-Ahead and Keolis, and has operated the South Central rail franchise since August 2001 and the Gatwick Express service since June 2008.
 In July 2015, the franchisee was subsumed into GTR, but the Southern and Gatwick Express brand identities were retained alongside those of Thameslink and Great Northern.
Network SouthCentral (NSC) was a shadow franchise that existed from 4 February 1994 to 13 October 1996, when Connex South Central took over the running of the franchise.
 The franchise is now part of the Thameslink, Southern and Great Northern franchise operated by Govia Thameslink Railway under the Southern brand.
 As with all shadow franchises, Network SouthCentral was a wholly owned subsidiary of the British Railways Board.
The Association of British Commuters (ABC) is a UK passenger lobby group for people who commute.
 It was formed in September 2016 by a group of passengers, disaffected by Govia Thameslink Railway's service on the Southern routes of the Thameslink, Southern and Great Northern franchise, after months of delays, cancellations, overcrowded conditions, and strikes.
Gatwick Express is a high-frequency rail passenger service between London Victoria, Gatwick Airport, and Brighton in South East England.
 It is the brand name used by the Govia Thameslink Railway train operating company on the Gatwick Express route of the Thameslink, Southern and Great Northern franchise.
Thameslink and Great Northern are the brand names used by the Govia Thameslink Railway train operating company on the Thameslink and Great Northern routes of the Thameslink, Southern and Great Northern franchise, previously operated by First Capital Connect.
Govia Thameslink Railway (GTR) is a train operating company that operates the Thameslink, Southern and Great Northern (TSGN) rail franchise in England.
 Within the franchise, GTR runs the Thameslink, Great Northern, Southern and Gatwick Express airport services.