Who are Nicola Sturgeon, Leanne Wood and Natalie Bennett, and what do they want?

It was one of the images of Election 2015.

Three women party leaders clutched in an embrace at the end of the second leaders' debate - the anti-austerity alliance of the SNP, Plaid Cymru and the Greens folded in each others' arms.

Between them, Nicola Sturgeon, Leanne Wood and Natalie Bennett have vowed to give Westminster the fright of its life.

So who are they and what do they want?

For the last in our Tonight series meeting the key political players in our General Election, I've spent time with them to find out, and to lift the lid on what sort of women they are.

One of them knows how to shear a sheep. Another once got so contrary at her birthday party, she hid under a table with a book. And one of them got chucked out of an Assembly session for calling the Queen Mrs Windsor.

Nicola Sturgeon was the one with the book under the kitchen table. She didn't care what the other girls thought - a single-mindedness that in part has propelled her to power - and she told me about it when I visted her home.

Dubbed by some "the most dangerous woman in Britain" - she's certainly one of the most scarily tidy; chez Sturgeon, there isn't a thing out of place. When I teased her with moving a book from one spot to the next in her home library, she admitted it would get moved back straight away.

We met Natalie Bennett a couple of days after her now infamous - and excruciating - LBC interview in which she fell apart and blamed brain fade. She tells me how she got over it, and how she has been trying to make the most of the Green Surge in party membership.

An Aussie by birth, she is the only party leader who knows how to shear a sheep. How does that help when you want to take the clippers to Westminster?

But perhaps the biggest rebel of the lot is Leanne Wood. I met her at her old school in Tonypandy, along with her History teacher, who remembers an impressively argumentative teen.

She joined Plaid partly as a two-fingers to those who assumed that she'd fall in with Labour. She still lives in the village where she grew up, fiercely proud of never leaving her home turf.

Unsurprisingly she's the one who calls the Queen Mrs Windsor.

Between them they want to put a jolt through Westminster which they describe as "pale, male and stale".

As the political landscape shifts beneath our feet, watch Tonight - New Players, New Politics 7.30pm ITV.