They say that in the case of a mysterious death the first 48 hours are critical. If investigators don't get a lead in this time - the chances of solving the crime are greatly diminished.

But what if you don't get a lead in in the first 48 hours, or 48 days.

What if you don't get a lead in 48 years?

Welcome to the mysterious case of Fred the Head - One of the UK's most curious, baffling and unsolved crimes