zipporah lisle-mainwaring accused of painting £ 15million house like a ` beach hut ' in row over planning application .
the paint job comes after planning applications to demolish home and rebuild it with double basement were rejected .
mrs lisle-mainwaring involved in row with family over inheritance after her husband robert died in 2007 .
she is the daughter of a second world war flying ace shot down during a bombing raid on germany in 1943 .