So I potted up the extra rooted runners and here's the result for my late season "Florence". That's 18 seedlings from one plant! How vigorous is that? The "Judibell" and "Cambridge Favourite" produced a dozen each as well. They get planted out at the plot in a few weeks time.
The other surprise is that our 1 plum tree looks like producing a bumber crop for the second year in a row. This proves my drastic pruning last winter has been positively beneficial.
The only worry is whether they ripen before the end of summer. (The same problem as with the tomatoes) It's been a horrible week for sun and temperature. The beans have noticed and the courgettes have just about been stopped in their tracks. Still, from this one there is hope...