The stems had all died back, soI concluded that it was time to dig my potatoes up. Not a bad crop for 6 sacks of compost and £5 of seed potato from the pound shop. Of course I have already had one bag as you know and they were very tasty. These should keep us going for a little while, with some given to Peter next door in thanks for his help recently.
Now they just need to dry off a bit and I can store them.