Ask them to explain it to you and see why the add collect is being charged. There should be no additional besides tax, which should be less than $1169. I am no tariffs agent, though.

The ticket is from Zone 2, and there is no ticketing deadline. I suppose it would be the departure of your first flight.

Your international flight is an international flight. This rule exists so that you don't buy a trip from Sweden and reroute your first segment out of London.

It just looks like they screwed up.
As far as your last statement, if I understand it right, you are fine. The joys of a paper ticket.