I was told when the new coins were issued, some years ago now, that they all would fit together in a design but they all seemed the same to me, so thank you for solving that.
I discovered this, or was told it, a while ago and was scoffed at on GN (no names!) for not knowing before. It's a very satisfying design idea, isn't it?
Ha Ha, downtoearth. DD put this on facebook and I did exactly the same until DSiL explained it. I then raided my purse and DH's very deep pockets to see if I could do it.
If you look closely gj you can see a shield where the lines join up with heraldry inside it? It took me some seconds to see it (and an enlarged photo!); I was totally unaware of this and thought the lines on the coins were just random