Smallish shower room/wc. Looking at wall with doorway behind you (left
to right):

width mm
0 280 600 160 510 500 800
window + gap + towel rail + gap + wash basin + gap + shower cubicle

The towel rail is standard issue (1999/2000 vintage) Henry ex B&Q & is
plumbed into the CH (off in summer) & also has an electrical heating
element up its left pillar.

The cable from the heating element goes up the wall (under plaster),
over the ceiling & down into a standard connection unit just below on
the right of the left pillar. That is fed from a switch (5A fused with
red indicator light) outside the door which in turn is spurred off a
ring main.

Q1: Is the element & switch in electrical zone 2 or 3? ie does it
matter that part of the heated towel rail is nearer than 600mm to the
wash basin, although the heater isn't?

Q2: Does the setup meet the regs? Is there a better way it could be
connected?

TIA for all views