You know you are right, hmm, maybe this will be illegal in the U.K. If it can be seen from the front.
Cycle law states you have to show a red light, positioned centrally or offside, between 350mm and 1500mm from the ground, at or near the rear, aligned towards and visible from behind. If capable of emitting a steady light it must be marked as conforming to BS3648, or BS6102/3, or an equivalent EC standard.
If capable of emitting only a flashing light, it must emit at least 4 candela.
The main points of RVLR (see below) are as follows:
- Lights (and reflectors) are required on a pedal cycle only between sunset and sunrise.
- Lights (and reflectors) are not required when the cycle is stationary or being pushed along the roadside.
- When they are required, the lights and reflectors listed below must be clean and working properly.
The road vehicles lighting regulations 1989:
Colour of light shown by lamps and reflectors
11.—(1) No vehicle shall be fitted with a lamp which is capable of showing a red light to the front, except–
(a)a red and white chequered domed lamp, or a red and white segmented mast-mounted warning beacon, fitted to a fire service control vehicle and intended for use at the scene of an emergency;
(b)a side marker lamp or a side retro reflector;
(c)retro reflective material or a retro reflector designed primarily to reflect light to one or both sides of the vehicle and attached to or incorporated in any wheel or tyre of–
(i)a pedal cycle and any sidecar attached to it;
(ii)a solo motor bicycle or a motor bicycle combination; or
(iii)an invalid carriage; or
(d)a traffic sign.
Also found this useful info:
http://www.cyclinguk.org/cyclists-library/regulations/lighting-regulations