Apparently if you are female in England, that is still a concern:

"Nicola Thorp was told in December 2015 that her flat shoes were unacceptable for a temporary assignment in London with finance firm PwC.

Her employment agency, Portico, had a dress code specifying that female workers must wear non-opaque tights, have hair with “no visible roots,” wear “regularly re-applied” makeup — and appear in shoes with a heel between five and 10 centimetres high."