The story
First Northampton was originally a municipal bus company, Northampton Transport Ltd, owned and operated by Northampton Borough Council. In 1993 the council sold the company to the GRT Group, who in April 1995 became part of FirstGroup.
During July 2013 it was announced via Northamptonshire County Council's website that route 4 would be withdrawn on 11 August. It was also later announced that the remaining services would be withdrawn on 14 September 2013.
From Wikipedia’s article on First Northampton, shared under CC BY-SA 4.0.3
