As I prepared to shred the cheque, I noticed something odd about the numbers. Why had Mum put two decimal points? She had written "41.12.0". Looking over to the written side of the cheque, I realised with a shock that here was evidence that Mum was already 'time travelling'.
Mum had written the cheque out in pounds, shillings and pence. UK currency went decimal in 1971.
If I'd seen this at the time I think I'd have felt a mixture of panic and victory: panic that things were indeed heading downhill and victory that I had some proof to take to Mum's Doctor. Nowadays, with Mum blissfully detached from worldly affairs, I can look at this as a curiosity and smile: Mum's in a good place.