No! 'Most collectable' is a tough one because what people collect is subjective. Rarest is probably that Olympic swimmer 50p with the lines on the face that was withdrawn, or was just the Royal Mint being sloppy. As the public aren't aware of it though, it's not generally collected like the dateless 20p was. It was mentioned in Coin News but the press haven't picked it up.The Olympic 50p's are also being tucked away.(Even my mother keeps them)