A record 29 managers in the top four English divisions were sacked in the first half of this season.

Brendan Rodgers, Tim Sherwood and Dick Advocaat were all replaced in the Premier League, while 10 managers were fired in the Championship.

The 29 dismissals across the 92 Football League clubs between 1 June and 31 December 2015 is the most ever at this stage of the season.

The highest number for a single season is 53, in the 2001-02 season.

Chart showing the average tenure of managers in England

Arsene Wenger has been in charge of Arsenal since 1996, elevating the Premier League average tenure

"We must continue to shine a light on this issue," said League Managers' Association (LMA) chief executive Richard Bevan.

"With the hire-and-fire culture engrained within football, it's so difficult to survive for any meaningful length of time in order to learn your trade, learn from mistakes and experiences. Managers must cope with instant judgements and, often, success and failure are rarely that far apart."

The tally of 29 dismissals at this stage of the campaign is two more than the previous high set in the 2014-15 season.

There have been five further managerial moves in January, with Steve Cotterill, Ian Hendon and Mark Robins all losing their jobs in the past four days.

See a table of all of the managers in England and Scotland here.

Chart showing the longest serving managers in England

Bournemouth boss Eddie Howe is the second-longest serving boss in the Premier League - he took charge in October 2012

A statement from the LMA said: "If the trend continues, we are on course to exceed the highest number of dismissals in one season over the past 10 years."

Chart showing total number of dismissals in each division of the Football League

In the Championship Blackburn, Brentford, Bristol City, Charlton, Fulham, Huddersfield, Leeds, QPR, Reading and Rotherham have changed managers this season

The managers dismissed so far this season had held their job for an average of only 1.58 years, and eight of the 29 were first-time managers.

Chart showing number of dismissals by 31st December in each season

This year has seen a record number of dismissals before 31 December

Arsenal manager Arsene Wenger remains the longest-serving current manager at 19.26 years, with Exeter City boss Paul Tisdale in second place on 9.52 years.

"Professional football is the ultimate results-driven business, with owners, boards and supporters' expectation levels going up and up year on year," added Bevan.

"Boards need to take a step back and look at their league position compared to resources, squad, stadium capacity, attendances, and compare themselves with other similar clubs."