I moved the Nasturtiums first. After filling a huge pot with compost and prodding a couple of dozen holes in it, I moved them by carefully uprooting them from their tray with an old teaspoon:

Some of them had quite big roots:

Despite my size I can be delicate!:

And here they are in their new home:

I have to say that they look a little ragged and unwell. Although after such a major operation (and they were a little parched anyway before I started) I’m not that surprised. Hopefully the gallon of water I just drenched them in will help them recover.