National League 1 clubs have united to join mounting calls for an overhaul of the way rugby union is run in England amid the ongoing crisis over record financial losses and executive bonuses.

In an open letter, the twelve clubs criticise "major failures in governance and leadership" and a "lack of accountability" before an emergency meeting of the Rugby Football Union (RFU) Council on Wednesday.

Championship and grassroots clubs have already called for a debate leading to a vote of no confidence in the leadership of the game's governing body.

Last month the RFU announced a record operating loss of nearly 40m, but chief executive Bill Sweeney earned 1.1m, after being awarded a bonus of 358,000 to go with his salary of 742,000.

Sweeney was one of six executives who shared a bonus pot of 1.3m at a time when the union is making more than 40 people redundant.

In their open letter, the National League 1 clubs say "recent events have shown change is required".

It added: "The RFU Council and Board are complicit both in the lack of accountability and governance the member clubs expect them to exercise, and, alongside the RFU leadership, in the lack of clarity and strategy for the development of rugby in England.

"We note there will be an emergency meeting of the RFU Council on 18 December. We call upon the members of the RFU Council to use this as an opportunity to instigate an independent review of the management of rugby in England.

"The National League 1 clubs will act individually when it comes to arguing for or voting on any no-confidence motions that might arise either at that meeting or at any subsequent [meeting] of the RFU."

The letter is signed by Blackheath FC, Darlington Mowden Park RFC, Dings Crusaders RFC, Esher RFC, Leicester Lions RFC, Plymouth Albion RFC, Rams RFC, Richmond FC, Rosslyn Park FC, Rotherham Titans RUFC, Sale FC, and Sedgley Park RUFC.