Prince William has been thanked after personally donating money to help London’s Air Ambulance appeal. The Duke of Cambridge is patron of London’s Air Ambulance Charity and has supported the charity throughout their recent #UpAgainstTime appeal. The appeal set a target of £15million to replace the helicopters for the London-based service, which the Prince said would have “life-saving impact.” The charity, which serves the capital, is funded through public donations and fundraising. A spokesperson from the charity said: “We are thrilled to announce we have passed our #UpAgainstTime appeal targe…