Dr. Annie Gray

And he used to hold court regaling visitors with the criminals that he'd tried.

And I think that made a very big difference.

impression on my dad who was listening in.

So the evidence against Anthony is stacking up but before our suspect could plan the perfect board game war breaks out.

He was too old for national service but he did work in a munitions factory in Birmingham making turrets for tanks.

Birmingham was a great target for enemy bombing.

So the blackouts were imposed very, very strictly.

The evenings were spent behind blacked-out windows and social life came to a halt.

So my dad did have time on his hands to think.

And now, with both the means and the opportunity, Anthony dreams up a plot.

The rules of the game are what my dad got the patent for.

It's like a detective novel translated into a board game.

Somebody's murdered, there's a limited pool of suspects and a crime scene, and the suspects are systematically eliminated to leave one, the murderer, who's then arrested.

Of course, every murder mystery needs a grand backdrop –

Meet our next suspect in the creation of Cluedo, Elva Pratt, Anthony's wife.

Her biggest contribution was the design of the board.

She was a talented amateur artist, so the actual representation of the board was entirely her work.

All the classic rooms that you would get in a country house.

A ballroom, a conservatory, a dining room, library and a billiard room.

But, according to Marcia, any talk of the game's Tudor mansion being based on a real house is simply a red herring.