In their letter, FOTA felt compelled to make one last-ditch bid to resolve their feud with the FIA. Their proposals related to the way the budget cap will be governed.
FOTA proposed the signing of a new Concorde Agreement — a document governing the sport — based on the 1998 covenant but with amendments to bring it up to date.
In his reply, Mosley insists that due to the time frame, it is not possible to look at all of FOTA's revisions and suggests a broad acceptance of the 1998 agreement.
Given FOTA's fears over intrusion into the teams' respective books, they proposed a top firm of independent accountants to "devise an audit methodology that would be implemented by all the teams".
Whilst agreeing a reputable auditor is the way forward, Mosley points out that a problem with the FOTA proposal was the absence of a clear figure.
He added: "We therefore propose you accept the 2010 rules as published."
It would then be possible for any amendments to be revised within a new Concorde Agreement.
The FOTA teams concerned are to now be sent a letter and, if signed and returned, it will make Mosley's proposals "legally binding and the relevant team's entry unconditional".
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