Followed a 7 back from around bishop Stortford to m25 on the m11 tonight. It had one working back light and didn't appear to have a number plate light or reflectors. It was almost impossible to see in amongst the traffic until you were right on it. If it's someone on here I'd get it sorted quick.
It turned off at the m25 clockwise and looked to be black(or dark colour) with orange logos on the back.