A Smidge Late Happy Birthday

Not quite sneaking in soon enough to wish sithdragn a very happy birthday! Hope you had a very good one, and long may you grace UNCLE fandom with your awesome presence.

Pros Era Question

I've got a question for the Brits on my flist that came up in writing a Pros story.

Circa 1978, how much would a Cadbury Fruit & Nut bar cost?

Thank you kindly.