There were plenty of technical issues I had to come to terms with in conjunction with the distribution of metal across the coin and the high-speed striking process. At one point I considered suggesting that half the 20 pence’s border — where it met the shield — be removed. It would have still been a rounded heptagon, only its border wouldn’t completely surround the coin. There were potential issues with this; I learnt that the distribution of metal wouldn’t be balanced, thereby possibly affecting the striking of the coins and the acceptance of them by cash machines. Oh well… this competition was a learning curve. And as someone who was unfamiliar with the technical aspects of coin manufacture - you have to ask don’t you?