Your mother must be so happy with you….I'm sure we've all done it as kids; if you point thr head at the ceiling, you can easily 'make it rain
A drain is not an outlet… unless your plumber isn’t very good.The fixed water outlet appears to be the drain, not the shower head. See the picture I posted in #26.
From the actual regs book...
Many shower trays have their drains toward one corner rather than central anyway.
That’s why I said it was a grey area.