The woman in the UK in question was working for an employment agency and was on contract to the accountancy firm PwC. 

BBC:-

"The original Portico dress code, now revised in the wake of the row, specified:
Reapplication of make-up and specifics on lipstick, blusher, mascara, eye-shadow and base
Nail varnish from a specific colour palette
The thickness of hosiery
No visible roots on dyed hair"

Plus shoes must have a heel 2"-4".