People have been commenting on the strange way that Prince William holds his pen.
For the first time ever the Reading of the Principal Proclamation was televised and many official documents have to be signed by the King, the new Prince of Wales and the Queen Consort. When it came to William's turn to sign documents he twisted his arm around in an usual way.
Now part of this was likely down to the fact that the desk he was writing on was very crowded and he had to maneuver round a silver ink well. However others have pointed out that the Prince of Wales is left handed and was having to endure something that many lefties have struggled with - writing with a fountain pen.