Measuring skin temperature with a thermometer contained in the shirt is relatively straightforward, but McLaren is also trying to measure core body temperature, which is trickier.

One lent out of the window and shouted, 'Ginger!' and threw a nearly full McDonald's strawberry milkshake at me which hit my upper body and exploded over my work shirt, tie and trousers!

The tiny leaves had re-created every curve and nuance of Jacob's face and hair, and oddly, the body wore the same clothes it had when she killed him: jeans and a dress shirt, rolled up at the sleeves.