Strobe lights - legality

Capri

See a m/cycle with strobes coming up behind me on the M50, he was fairly motoring but as he got closer the lights were actually white and it wasn't an emergency vehicle but cars moved out of is way thinking it was an emergency vehicle, as he passed he had a red rear strobe going as well - the 'giveaway' if you like was it was a 'cowboy'd' bike and he had a stars/stripes helmet.
I'd presume the white / red strobes are not illegal per se so would a 'impersonating an emergency vehicle' charge stand up in court, or not

s8n

Let it go. He got you to move over so achieved his aim

iceage

Blood bike maybe, although I doubt it they carry the correct gear.

Shield

Moved from ES to LD with redirect expiring in 14 days.

the world wonders

S.I. No. 189/1963 - Road Traffic (Lighting of Vehicles) Regulations, 1963 wrote:

Restrictions on flashing lights.

42. No lamp (other than direction indicators) fitted to a vehicle shall show or be constructed or adapted so as to be capable of showing a flashing light unless such light is invisible to persons outside the vehicle.

Amended in 2009 to allow flashing lights for cyclists, but they're still banned for motorists.