Having a poke around the garden, it looks as though the foxgloves that I thought weren’t quite ready to plant out are looking SUPER (much bigger, sort of cabbagy shape) while the ones that I thought were ready are a bit the worse for wear.
I have reminded myself that gardening is a learning experience. Even really good gardeners get things wrong sometimes. Next year, I’ll just plant out all the foxgloves much earlier (October?).