Posted: 25/07/2014 at 14:35
Are the grubs 'C' shaped? If so, it's vine weevil and you can't use vine weevil killer on edible crops but could try nematodes. However, I fear it will be too late to save your crops for this year but treating with nematodes should help prevent the problem next season. Alternatively, you can tip out all of the affected tubs onto a large plastic sheet, spread the compost thinly and let the birds have a feast.
As an aside, it is very rare for vine weevils to attack things grown in the ground, but they LOVE anything grown in containers, unfortunately.