Jersey Royals Tossed in Balsamic Vinegar & Walnut Oil Dressing

700g (1 1/2lb) small Jersey Royal Potatoes
1 clove garlic, crushed
45ml (3 tablesp) walnut oil
15ml (1 tablesp) balsamic vinegar
1.25ml (1/4 teasp) powder mustard
1.25ml (1/4 teasp) ground black pepper
To garnish:
15ml (1 tablesp) chopped parsley and
red currant jelly