Most landing accidents are caused by landing too fast. The approach speed is 33% above the stall speed, so there is no need to add more. To do so increases your risk of a landing accident! A CAA examiner will expect you to land at the speed indicated in the aircraft manual. I would expect:
For a PA 28-140 - 70 mph with Full Flap
For a PA28-161/180 - 65 Kts with Full Flap