No problem!
The qualifying amount is presently 10 points (1 game), so as long as they had registered to get a fan number & the ticket for that match before was linked to it, they will have been fine. The staff in the club shop are usually pretty helpful and will go out of their way to help...
Pretty much, yes. Though it's not just for STH.
It basically links friends & family together (whether STH or not) via their fan numbers (+ surname + postcode). You can do it by going online and adding people using their fan numbers & other details.
E.g. if I want to sit with my dad + 2...