In the British Museum trays is a coin that was initially considered to be a medal relating to the erection of the Royal Standard in 1642. This note presents in detail the contemporary references confirming that the piece is actually a pattern for a proposed debasement of the coinage in late July and early August 1640. One reference describes the design in sufficient detail to leave no doubt about the attribution and dating. Though Mint buildings had been prepared for the production of a debased coinage, none were ever issued. For his part in the project the Earl of Strafford was found guilty of treason and executed on 12 May 1641.
Revisiting an Enigmatic Charles I Pattern Shilling – Gary Oddie
BNS Research Blog 
Gary, this is a lovely piece of historical commentary. Thank you for sharing.
Hi Graham, glad you liked it. It was good fun bringing all of the strands together. It turned out that I had most of the references on my shelves anyway, but I had not made the connections before.