My sister's photograph

Many, many years ago my older sister was a student nurse at a London hospital. A medical publication needed a doctor and a nurse for a photo shoot demonstrating a new piece of equipment and my pretty sister was selected. About six years later I was a newly qualified secretary and was sent to temp at an office in London. As I walked into the building, the first thing I saw on the wall behind the Reception desk was the most enormous blow-up photo of my sister in uniform - of all the thousands of offices in London, I had been sent to the head office of the company that manufactured the equipment.