I am sorry to hear of your problems, Chas. It is very disheartening when you work so hard for so little return. It happens to us all sometimes. (Not the vandalism though) We cannot grow carrots at all; maincrop pots are a waste of time because of blight, peas germinated and then disappeared, parsnips did not germinate at all, onions are very poor this year and there may be white rot in the soil so we will have to stop altogether, the outdoor toms have blight too and been binned. The asparagus was bitter, the fennel bolted.
But we have had super crops of early and second early spuds, french beans, mange-tout, more fennel, indoor toms, celery, leeks, cauliflowers and cabbages till we look like them. Radishes, spring onions, swedes, all have done well. It is a question of finding out what will grow and adjusting your sights. AND watching paint dry is so inactive. Again we do sympathise.