Yep I remembered I had an old gardening magazine so I hunted for it and found out that I have OD the poor buggers .Airgead said:I seem to recall from something Peter Cundall once said that too much nitrogen feeding will make them all leaf and no head. Apparently you want a diferent N:K ratio with less of the N and more of the K I think.
I've got a couple of each still coming on as seedlings so I'll bung them in a different patch and sharpen up on the fertilizer regime.
Getting a bit late for planting such vegies ( as I understand) by I'm not going to let them go to waste or give up....I will grow a cauli and broccoli successfully this year !