Answer: Zones are now 0, 1 and 2. In a shower cubicle, Zone 1 extends to 2.25m above floor level. Above this height is outside the zones. Zone 2 extends 600mm horizontally from the shower basin and is 2.25m vertically above floor level. Above this height is, again, outside the zones.
If a luminaire is installed within the Zones, it should be suitable for use in that Zone. e.g. IPX4 for Zone 2. The luminaires can be either mains or SELV.
NB: Remember that all circuits within a bathroom/shower room should now be protected by a 30mA RCD regardless of which Zone they are installed in.
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