Operative Procedure: Foam Sclerotherapy Group The axial vein will be cannulated under local anaesthesia with an 18G (green), 20G (Pink) or 22G (Blue) Intravenous cannulae under ultrasound guidance with the patient reclined in a supine position for GSV or ASV treatment, prone position if SSV or GV treatment. This will be performed at the lowest point of demonstrable reflux and throughout the length of the incompetent vein at 20cm intervals. Each insufficient tributary system will also be cannulated separately. Venous blood will be aspirated and the cannulae flushed with normal saline to confirm that each is inside the target vein. Local anaesthesia can be used at each puncture site prior to needle insertion if desired by the patient. Once the cannulae are secured the leg is elevated to empty the veins.