Manba involves devotees wearing dark tans, white make-up around their eyes and hair that is often a combination of neon colours.

Manba in Japan is also known as ganguro, gonguro, yamamba and mamba.

Yama-uba in Japanese is the name of a mountain hag in Japanese folklore whom the fashion is thought to resemble.

When the practitioners began darkening their skin, widening their eyes and wearing blue contact lenses, they were making a rebellious statement against the traditions of fair-skinned beauty.

Eilish insists that she is "not mocking anybody" and Declan asks, "what black person looks like this?"

The British followers of this Japanese subculture are also into the music, which is called Eurobeat, and practise dance moves called Para-Para.