From the Wikipedia page [1] London Buses route N109 is a Transport for London contracted bus route in London, United Kingdom. The service is contracted to Arriva London. History Route N109 began operating in the summer of 1994 between Aldwych and Croydon via Trafalgar Square, Brixton and Streatham; then continued either to New Addington or to Coulsdon via Purley.[16] On 28 August 2010, route N109 was reintroduced to replace the discontinued N159 between Oxford Circus and Croydon. Route N109 will be passed to Abellio London from 31 January 2015