It’s always handy for parents to have someone they can use to put their children off any particular profession. ‘Don’t be a comedian, son – you’ll end up like that Eddie Izzard!’ ‘Don’t be a journalist, my girl – you’ll end up like that Julie Burchill!’ Quite a few politicians have vied for this inverted ‘top spot’ – that Jeffrey Archer, that Matt Hancock and that Jeremy Thorpe come quickly to mind.