DAY BEFORE: in a large bowl combine the garlic, oregano, salt and pepper, red wine vinegar, olive oil, prunes, capers and bay leaves
Add chicken and mix thoroughly … cover and refrigerate overnight
Thirty minutes prior to cooking remove chicken from fridge
Arrange in a single layer in a large baking dish and pour marinade over
Sprinkle with the sugar and wine
Preheat oven to 180 degrees, fan forced
Bake for 30 minutes, test a single piece of chicken breast (if there is a lot of pink in the middle cook for another 5 minutes)
Remove baking dish from oven, cover with alfoil, then a tea towel on top of the alfoil, and let the chicken rest for at least 30 minutes and up to an hour (if you wish to serve it hot leave it no longer than an hour, otherwise it can sit for an hour and a half and still be quite warm)
Remove chicken and slice into thick pieces, put onto individual serving plates with some of the capers and prunes and pour sauce over (or you can slice chicken and put onto a large serving platter, topped with the capers, prune and sauce)
Sprinkle with herbs and serve