When you phone up on the 19th, say you want 4 and all have attended 3 away games. They tend to check the first accounts history but not the rest so you could get all 4 on the 19th. I've just succesfully got an extra ticket by doing it
And im 18, i asked for an u19 ticket to find out the is no such thing, apparently a typo on the OS, and its actually u18