Mix the flour with a little salt and pepper and use it to dust the skate wings.
Heat a knob of the butter in a large frying pan, add the skate and fry gently for about 5 minutes on each side or until cooked through. Remove with a slotted spoon and keep warm on serving plates.
Add the remaining butter, balsamic vinegar and capers to the pan and cook over a medium heat, whisking until bubbling and syrupy. Season to taste with salt and pepper, then pour over the skate. Serve immediately with boiled baby new potatoes tossed in chopped parsley and a side salad.