I have given each PSB plant a sturdy 4-foot hardwood stake, which I hammered well into the soil with a heavy hammer to make sure they are secure. I tied the plants very loosely to the stakes, using several turns of soft string. The idea is to provide stability in strong winds without restricting the plants' growth.
Since I had the netting rolled back to facilitate the putting-in of the stakes, I took the opportunity to weed the bed and to give the PSB a dose of general-purpose plant food (liquid Growmore in this case).
As soon as I had finished the job the netting went back on, because there are still quite a few white butterflies around - though all the other varieties are conspicuous by their absence. I noticed a few Whitefly lurking under the leaves of the PSB, so sometime soon I will need to spray them with washing-up liquid like I did with the Brussels Sprouts the other day.
In my photos you can see the Leeks along the edges of the PSB bed. I don't know whether they will be any good - they may perhaps be too shaded - but it's always worth a try, to maximise the yield from a small space. The ones between the rows of Parsnips have been completely swamped, and I don't expect them to be worth having.
Incidentally, I didn't need to use any of the spare PSB plants that I raised. Most of them were eventually given away to a friend and the last remaining one went in the compost bin last Sunday. My "insurance" paid off.