Ferrari president Luca di Montezemolo, who heads the Formula 1 Teams Association (Fota), wrote to Mosley last week to express concerns about the cost cap which he said could lead to a two-tier F1.
The Philpotts wanted a bigger house, Mr Mosley allegedly told his friend, and Mrs Philpott apparently wrote a suicide note in which she took the blame for the fire, saying she would take the children with her next time.