Thoughts of ageing press into my mind as I approach 50. University contemporaries are starting to fall ill. High blood pressure, hernia, even a mild stroke – a shocking experience at any age. At a recent party I noticed an attractive woman of about my age whose lips seemed unnaturally pillow-like: evidence, I suspect, of collagen injections designed to mimic the plumpness of youth.

It is amazing, watching reruns of old television shows on ITV4, like the mould-breaking police series The Sweeney, how old everyone used to look.