The shorts I wear to bed have a back pocket. When I chose to buy them in a twin pack with a tee shirt, the pocket was not a deciding feature. However, I acknowledged that it was there by design.
For months I gave it no further thought. For months it was as redundant as a breast pocket in pyjamas.
Then one morning, as I was juggling with a cereal bowl and clothes from the dryer, I slipped my phone, still playing a pod cast, into my back pocket.
And for a moment, as the conversation followed me upstairs back to the bedroom, I smiled at the foresight of M&S. I should have realised: they know their stuff.