A new rules package is needed for 2008 onwards after the current Concorde Agreement expires but teams have delayed discussions as a row over the commercial side of it rumbles on.

Mosley today wrote to all 10 teams and invited them to a meeting on April 15 to discuss ways of cutting costs for 2008 or, if unanimous agreement is reached, before then.

He wrote: “It is only through discussion that progress can be made.

“Now is the time to start talking about 2008 because the sooner we start, the more likely we are to find consensus.

“At the same time it may still be possible to reach unanimous agreement for a limited number of cost-saving measures during the current Concorde Agreement, perhaps as early as 2006.

“But this can only happen if everyone participates in the discussion.

“Soon after the April 15 meeting, change for 2006 will become increasingly difficult and/or expensive and unanimity will no longer be achievable.

“I urge you to come to the April 15 meeting.”

Ferrari and their nine rivals have drifted apart since the Italian team broke ranks to sign an extension of the Concorde Agreement with Formula One commercial rights holder Bernie Ecclestone.

The other teams are still holding out for commercial concessions and continue to talk of a breakaway series as a last resort.

Common ground was found on ways to cut costs in the sport at the Heathrow meeting between Mosley and Ferrari representatives.

Both Ferrari and the FIA agreed they wished to introduce standard braking systems, which would save around £600,000 a season.

“The implementation for such a system was proposed for 2008, but would be possible in 2006,” the minutes of the meeting reveal.

A £1million saving courtesy of a move to use long-life transmission parts was proposed and “could be introduced in 2006 if a decision were taken by April 2005”.

A similar proposal to introduce standard suspension parts would save Ferrari £1.2million a season and the FIA would back its introduction in 2006, providing other teams agree.

The minutes of the meeting also revealed the FIA’s “strong” desire for a single tyre manufacturer, a plan which last season appalled Ferrari but this year received a warmer response.

Such a move would slow tyre development – and hence speeds – as well as reducing the need to test frequently.

Suggestions that driver wages should be capped and an age limit be placed on teams’ second drivers – both of which came from Renault boss Flavio Briatore - were rejected outright by both Ferrari and the FIA.