Unlikely chains of events

I travelled to an oil refinery in Wales for a business appointment. There was an accident on the motorway which caused me to be an hour late for my meeting. When I arrived I was advised by the gateman that my contact had gone to lunch 10 minutes earlier. I asked him if there was somewhere local I could have lunch and he recommended a local pub. On walking back to my car a gentleman told me he had overheard my conversation with the gateman and didn't think the pub he suggested was very good and suggested I follow him to the pub he was going to. After we had ordered our lunch he commented that my accent suggested I was not from Wales. I told him I was from Scotland and he said that he was born in Edinburgh. I told him that I had an aunt who stayed in Edinburgh and that I stayed with her many times during the summer holidays. He asked me where she stayed and I told him her name and that her address was Hermitage Park in Leith. He then told me with astonishment in his voice that he stayed in the house, across the landing at the top of the stairs, from my aunt (their doors were 12 feet apart). It was at this point we exchanged names and realised that we had played together as children many times. He was further surprised when I told him I could remember that he was practising to play the violin all those (around 40) years ago. He told me he still played the violin.