Season two of the BBC’s reboot of the Arthur Conan Doyle classics concludes with Sherlock coming full circle as he again faces off against his nemesis, James Moriarty. Our hero finds himself ensnared at the centre of a web of lies of Moriarty’s making, as he battles to save both his own reputation and the lives of his closest friends.

Spoilers below …

I stumbled across this poster recently and – aside from the fact that you probably have to be of a certain age to understand why cassette tapes and pencils went together – it got me thinking about the various audio storage and playback formats which I have come across in my lifetime.