Short answers, pulled from the story.
The first coins minted in Britain appeared around 80 to 60 BC when Kentish tribes like the Cantii imitated designs from Marseille. These early pieces were cast rather than hammered and marked a shift from Celtic tribal traditions to organized currency production.
Isaac Newton became the mint's warden in 1696 under the patronage of Charles Montagu 1st Earl of Halifax. His role was intended as a sinecure yet Newton took it seriously attempting to combat growing problems with counterfeiting.
Small Welsh town Llantrisant northwest of Cardiff eventually chosen for new facility. Work began in August 1967 constructing blank treatment plant and striking plant.
The success led to similar branches opening in Melbourne on the 2nd of June 1872 and Perth on the 20th of June 1899. Following Federation of Australia in 1901 and establishment of a separate Australian pound in 1910 Commonwealth government used all three branches until the Sydney branch closed after 72 years at end of 1926.
As a result the Edinburgh mint closed on the 4th of August 1710. The Acts of Union 1707 united England and Scotland leading London to take over production of Scotland's currency replacing the Pound Scots with the English Pound sterling.