This is important because pedal manufacturers are not taking much notice of the UK regulation, because most other countries don't have such a law. The result is that all the best pedals, the ones with modern foot retention systems, do not have any facility for the attachment of any pedal reflectors at all.
It is true that all bikes have to have pedal reflectors at the point of sale, but only if sold with pedals. So cheap bikes have pedal reflectors which probably remain in-situ, which is all well and good, but better bikes either come with no pedals or with token pedals that are immediately replaced with something more functional, to which reflectors cannot be fitted however.
Its like as if the only skis you could legally use in the dark were those with old-fashioned leather straps!
The only direction in which pedal reflectors have any proven use is from behind. So my suggested alternatives provide additional conspicuity in that direction.
Britain is too small to zig while the rest of the world zags. The Police take no notice anyway. Please support this idea.