"Appointments aren't offered after 16:00"

My son called the surgery for an appointment after his work. The receptionist told him that they don't do appointments after 16:00. When he asked what happens to people like him who work, he was told he would need to make time. He asked if he would need to go to the hospital and was told no, because he had been offered an appointment albeit not one that suited him.

He felt that the receptionist was rude so he googled the practice information and called the surgery back and asked to speak to a member of management staff. He was put through to a staff member who demanded where he got their name from and when he told them he googled the information, they didn't seem too happy. My son explained the situation and how he felt that the receptionist was rude. He was told that if they had to cater to everyone the G.P's would need to be there 24hrs a day. He was then miraculously offered an appointment for 16:30 that day. We still don't know why appointments aren't offered after 16:00 despite the surgery being open till 18:00.