Changes to the rules on succession have moved closer after David Cameron shared his plans with the 15 other countries who have the Queen as their monarch.The PM wants to scrap the ban on spouses of Roman Catholics ascending to the throne and give girls the same right of succession as boys.But he needs the 15 other Commonwealth nations to agree to the changes.They would apply to any children of the Duke and Duchess of Cambridge - even if they were born before a law change.At present, the Act of Settlement gives male children the right to leapfrog their older sisters in the order of succession to the throne.'Historical anomaly'But in his letter, Mr Cameron said: "We espouse gender equality in all other aspects of life and it is an anomaly that in the rules relating to the highest...