Hounds, I'd agree there's a good chance that they're not warm enough. This is my first experiment with a heated propagator so I'll be interested to see how they do. I have started sweet peppers, watermelon, melon, 3 types of tomato (San Marzano, Gardener's delight and Sungold), tomatillos, miniature pumpkins and cucumbers.
I think the cranberries are technically cowberries so not so fussy. They apparently like the same sort of conditions as blueberries so they've gone in the same bed.
It's clear that the previous owner of the house has worked the clay soil here very well (we found vast quantities of leaf mould in bags when we moved in). The beds are lovely and rich but the unworked bits look more suited to making pots and are soggy in winter and rock solid in summer.