Ben and Corinne begin by looking at the basics: the biological sex and age of 4926.

But when dealing with a centuries-old skeleton, nothing is straightforward.

-I think the big question for me first of all is: male/female?

I mean, it's not always easy.

-It's not always easy.

We've got to do it by lots of different features around the body.

And we're looking primarily at the pelvis because that's primary sexual dimorphism.

In other words, that's what changes at puberty.

So this area here, this is called the sciatic notch, because this is where the sciatic nerve passes through.

In a male, it will stay in the narrow form, as you would find in a child.

but in the female it grows at puberty, it opens out to make the pelvis bigger.

-I remember you teaching me years ago, there's something to do with the actual angle and you can measure it against your fingers as a very loose estimation.

If it's a certain angle, it's male.

If it's a slightly bigger, it's female.

-In females, the angle will be more than 90 degrees and can be very, very large indeed.

What we're seeing here is a little bit smaller than a right angle, only just a bit smaller.

It is slightly more in the male area of his pelvis.

-Okay.

-So that's a good start for us.

-But that's not, that's not the whole picture, as you say.

The skull is very important for helping determine male or female.

-So, first of all, let's look at his frontal bone, immediately above the root of the nose.

And you can see that you've got this heavy bulge on the frontal bone.

So this is the real, sort of, "Arnold Schwarzenegger" brow ridge.

-So I would typically have a brow ridge, being a big, dominant, strapping... -Dominant primate!

-male.

(both laughing) -And you wouldn't typically see one as accentuated, or even really present, in, in yourself, for example.

-Yeah, that's absolutely true.

And, in fact, I have no brow ridge, having seen my own X-rays.

-You've said male a few times.

Are you confident this is a man?

-Absolutely confident.

He's coming out as male, or probably male, in every one of the features that we can score.