60 kts sounds more like a 'roundout' speed than an approach speed.
60 kts on approach is dicing with death in a PA28, especially on the kind of days we will be seeing plenty of in the UK over the next few months. My POH states 72 kts approach speed.
Same technique works equally well for all PA28s (up to 180s) - fly the approach at 70, when you're about 30-40', get the power off, which usually gives a roundout at about 60 kts, and a touchdown speed of about 45-50 kts. This is with a runway that isn't stupid short or undulating or whatever, in which case, chase the numbers and fly flat.
The bottom line is, why don't you ask this question to your instructor? After all, he/she knows your flying, and knows the runway you're flying from...
