Only evidence I went to London

I went to London today. This was the only evidence that I'd been - some Japanese bowls from Muji.
I learnt once more that I am not a savvy business traveller. 
For some reason I  thought it best that I travel to London and back in a day. It all seemed like a good plan on paper, but it took one pothole on the runway at Heathrow to throw all my plans into the air and take a giant jobby.