We are both 77, DH is 4 months older than me, and we had our letters on Monday, presumably because we are more or less the same age. We went on line at the same time and picked the same day and time slot. My friend in Bedfordshire is 77 like us and her husband is 80 next month. She had a letter on Monday, her husband didn’t have a letter but she is vulnerable due to health issues. The only vaccination centre available was too far for them to travel to so she called the number on the letter and she was offered an appointment at her GP practice today. She mentioned her husband’s age and that he has to accompany her and he was given an appointment for the same time. These are only two cases but I would conclude that vulnerable people have precedence, then over 70s in age order. I don’t think being in the same household has any sway on when you are called unless one person is a carer for the other.