Hi Mr catcuddler,
As a retired Driving Instructor I can give you advice on what I understood to be correct when i was working (about 5 years ago)
1. You must not overtake any moving motor vehicle (this does not include Push bikes ) in the zigzag area approaching the Zebra. But you must not overtake any vehicle (including Bikes) that are stood at the crossing in order to allow pedestrians cross.
2. The high risk times are at dawn and dusk, also outside schools and playgrounds near to school starting/finishing times.
3) The places that are potentially high risk are near schools and playgrounds. Near to bus stops. Approaching sharp bends or the brow of a hill. Also when making a right turn across busy traffic.
4) A zebra crossing with a central refuge should be treated as 2 separate crossings.
5) I am assuming that you mean that the staggered pelican has a central refuge, if so, the same applies as a zebra, with a refuge - treat it as two crossings.
6) Any adverse weather conditions (rain, snow, fog, wind and even sunshine) can affect your visibility. So in all cases, drive slower to give yourself more reaction time.
Hope this is of some help and I wish you well in your future instructing career.
Denis