I plant flowers; marigolds and Cosmos between the vegetables, with sweet peas around the edge. This encourages the bees and insects. Alternatively you could always Go round them with a paintbrush, pollinating.
Some years ago I visited Barnsdale, the home of the late Geoff Hamilton. There was a cottage garden with veg and flowers grown together, so now I do it.
Hundreds of illegal migrants to be put in existing military barracks
