Zara and Mike Tindall are still “head over heels”. The couple tied the knot in Edinburgh on July 30 2011 and after 13 years of marriage, their relationship is only getting stronger. Former BBC royal correspondent Jennie Bond told OK magazine: “They seem to just get better and better as the years go by. It’s really great to see a couple who are still clearly head over heels for one another and act like newlyweds when they’re out and about. They are the most tactile of all the younger royals and also the most fun loving, which makes them immensely likeable.” Jennie went on to praise Olympic eque…