If you learn the 'point-and-power' technique, you will be scanning your speed constantly throughout the approach until you begin the flare. Continuous and prompt attention to touchdown point and appraoch speed are the keys to success - and it's SO easy to teach and for the student to learn.
I will NOT allow any student to solo until they can fly an accurate approach speed at the POH speeds - as stated above. No need to 'factor in 5 kts' - that's just acceptance of poor standards.
As a fellow UK Flight Examiner, I concur with BlueLine.