"A complaint about absent services"

I took my mother in to Stoke Mandeville hospital for a Dermatology appointment. this was fine & on time, however they wanted a photograph so we went to the Medical Photography department, at about 10am. The sign said that the photographer would be back from their rounds at 10: 30am so we waited. At 11am, with no-one having turned up, I phoned the main reception number to ask what was going on. After a brief wait I was advised that they did not have a photographer in that day. Why hadn't the user department (in this case Dermatology) been advised so they would know not to send people there, and why wasn't there a simple message posted on the Photography department door advising of the situation? I am self-employed and have lost earnings because of this easily avoided situation.