I to think there is nil investment potential in the undated 20p coins , the most i got for one was £70 which i took and reinvested via paypal in decent collectable coins. I am happy to keep one of the kew gardens 50p coins though - it is really atractive and they will soon have all disappeared from circulation leaving few hanging about 210,000 mintage is really low for any modern coin . If that london mint office had given the same publicity to the general public about the scarcity of these 50p coins the would it be worth £50 each now ????