I am delighted to report that the first pollinators like the bee above are visiting my wildflower trough.
I have to say, though, that the flowers thus far bare no resemblance (as far as I can tell) to the pictures on the seed box! This charlock/mustard/oilseed rape-like plant is very tall, far too tall to stay upright in the windy conditions. When a stalk topples over, it takes any number of more delicate plants with it, which is a shame, particularly since most of these are barely in bud yet.
There have been a number of these bugs, which, thanks to the kind people on iSpot, I now know is a Cabbage Bug (Eurydema (Eurydema) oleracea).
You can just make out my trough up against the trellis, behind the Begonias and Nasturtiums. Those yellow flowers must be a metre high.