This tells us what regulations there are on indicators:
http://www.legislation.gov.uk/uksi/1...chedule/7/made
It says rear indicators on a bike need to be 400mm apart and visible from a distance. I guess if they aren't clearly visible you could get in trouble but apart from that there doesn't seem to be an issue.
I read up in the brake lights too and motorbikes only need one, so when one indicator is going, the other light strip will still be showing red.
I can't see any issues with them. Anyone?