A good rabbit proof fence would be your first line of defence, one were the chicken wire is buried under ground and then turned outward to stop them burrowing under.
A terrier would be another good choice if you like dogs. You don't mention mice, now they don't like onions and garlic or the smell of FBB so surrounding your plot with either or would in part deter mice although you can't plant onions/garlic each year in the same spot.
Fox's like the smell of FBB and go after rabbits. A sprinkling of FBB would be another good choice, attract a fox to kill the rabbits, unless it's an urban fox which has adapted to eat stuff from bins most will leave your veg alone, I maybe wrong on this latter point though?
Also try planting some stuff which rabbits don't eat, it's my understanding they leave fruit bushes alone and rubarb.
Apart from the fence, I'm trying out some of the above stuff this year on a new allotment for the first time so can't speak from experience. The information was gained from reading books and stuff on the internet, someone else maybe able to offer better advise...