David Moodie wrote:
On regular wall tiles drilling them is a doddle, but the ones that
I've got up are 9-10mm thick porcelain.

I'm looking at about 20mins for a 6mm diameter hole using a
combination of 6mm and 8mm tile drills and a 6mm tct drill. I
persevered with using standard Bosch and B&D tile bits but as
I've still got 9 holes to drill to mount the shower rail, screen

Get a grinding wheel (pref. with water feed or trough), sharpen
some ordinary TCT masonry bits so that they look like tile drills.
Drill the hole and change bits regularly! Sharpen bits, next hole...
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J.B.