Griffiths first worked at Lloyds Bank International from 1975–79, then at Samuel Montagu & Co Ltd from 1979-90, and lastly as deputy general manager at Nomura Bank International plc 1990-91. He was chief executive of Lynton Bardwell Ltd and Managing Director of CL BES Ltd from 1993 and a director of the Suffolk Development Agency, Greater Cambridge Partnership and chairman of the Western Suffolk LSP from 2004.
Council member
Griffiths was first elected onto St Edmundsbury council as the member for Ixworth ward at a by-election in 1997. In the subsequent four elections he was returned unopposed in all but that held in 2007. In May 2002 he became the leader of the Conservative group when the previous leader was asked to step down after less than two years in the post. In May 2003 the Conservatives regained control of the council and John Griffiths was therefore elected as council leader.
Council leader
In his first eight years as council leader the following improvements were seen in the borough's two towns of Haverhill and Bury St Edmunds. These were either been facilitated or initiated by the council. Haverhill Queen Street improvement; new multi-screen cinema; Tesco supermarket and refurbished leisure centre. Bury St Edmunds New arcshopping centre with Debenhams anchor store, underground car park and 600 seat apex performance centre, all designed by Sir Michael Hopkins ; new multi-screen cinema; refurbished leisure centre; rescue and conversion of historic West Front of ancient Abbey into new properties. Among general successes during Griffths' leadership of the borough council are its record of waste recycling, both national and regional. Council tax has also been frozen or kept below inflation during most of Griffiths' term as leader. In 2011 he led the negotiations with Forest Heath district council which led to the two authorities sharing one chief executive and management team,which led to St Edmundsbury freezing council tax in subsequent years.
Opposition
Griffiths' achievements have not been popular with everyone. In particular there was significant opposition to the arc and apex, known locally as "the cattle market development" because of the former use of the land more recently used for car parking. A somewhat shadowy organisation self styled "The Knights of St Edmund" had previously put a curse on the development , describing the council as "Judas Iscariot". Despite this the development was completed and was the subject of praise.
