The Champions League Final has more viewers, throughout the world, than any other annual sports event:
http://news.bbc.co.uk...ll/europe/8490351.stm
The only football match which ever gets higher viewing figures is the World Cup Final.
Keep checking this link, throughout the next couple of weeks, until the relevant figures show up. The Final will almost certainly be near to the top of the table:
http://www.barb.co.uk...TopProgrammesOverview
Incidentally you ask if football fans in other countries would be interested in watching two British teams play. I sometimes use a Portuguese café (in Thetford) where only Portuguese TV is shown. The football which dominates their coverage is not the domestic league in Portugal; it's our Premier League (which is shown live across Europe and has a massive following in the Far East).
Chris