Left for a week because I have been on holiday - all calabrese heads had bolted even though they still seemed small enough to leave - I took one big head on Saturday 4th July before I went. Big fat juicy green caterpillars has been munching away on the cabbages - clue - frass on leaf - they tend to be under the leaf. I cut off all the flowered heads - maybe a second flush will come. The first one that I cut already had three sizeable heads. Lettuce looking like they are wanting to start to bolt.