Your first port of call is to look at the hub gear. Clean it off and it may have a year on it.
Next thing to look at is the shifter. Someone will find that interesting. It's not a trigger shifter or a quadrant shifter, so it looks odd with a hub gear at the back. Maybe the back wheel with the hub gear has replaced a derailleur or maybe it's something interesting. Or, if it or the back wheel has been added at a later date it may be a total red herring.
The frame fittings look derailleur like, and the back rim looks a bit fatter than the front, suggesting that maybe this wheel is perhaps a replacement, and was never cabled up for the hub gear to work.
More info on Fred Dean with dates (1958-late 60s), and some clues for deciphering frame numbers here:
http://www.classiclightweights.co.uk/builders/fred-dean-builders.html
Let us know how you get on.