The rio coin is one that seems to have been released into circulation in my area, I have found several they are worth keeping in mint grade . Mary rose £2 coins and the tube £2 coins are actually rarer than you might think. The rarest are of course the 2002 Commonweath coins as stated above . Dickens coins are not worth any premium, though they might be if kept in mint grade for a few years. The spade guinea coins are worth considering as well