I AM about to have my left leg paralysed, my arm taken over by an alien force and, quite possibly, be made blind. I confess I’m a bit nervous. But also, strangely, I hope it all works.

These insults to my body will not be inflicted with a scalpel, but instead induced using hypnosis. The effects, if they occur, will only be temporary, my hypnotist, David Oakley, reassures me.

It’s all being done in the interest of science. Oakley is an emeritus professor at University College London …