I'm a bit jealous of those people a few streets away who have a Monkey Puzzle tree in their front garden. It looks so cool.
@hazardwarning There wasn't one definite moment when it went but I'd been doing a lot of lifting, including lifting my mother's mobility scooter. Anyway, after six weeks it's about 75% better so I'm now getting things done instead of being a plank.
Apparently, injuries like the one I have to my back can take twelve weeks to heal.