Underground meeting

My cousin is retired and he and his wife live in a little village in Somerset. My cousin goes to London from time to time. I am retired and my wife and I live in the countryside in Morayshire about 600 miles by road from my cousin. We go to London about twice a year, for a maximum of two nights. My wife had an appointment in NW8, otherwise we would not normally be in that area of London. Afterwards we went to the St John's Wood Underground Station where one has to take a lift down to the platforms, so there can be short delays awaiting the lift. I believe the trains run about every five minutes. We had been waiting a few minutes when from the lift appeared my cousin. We had no idea eachother were in London, and normally only meet at family funerals, perhaps at three yearly intervals (though sadly that may increase at our ages!). I have often wondered what the odds were of us meeting, but I guess many millions to one?