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I was riding home today and was stopped by a police car. The officer informed me that 10 days ago a speed camera car photographed a motorcycle travelling at 127 kph in a 100 kph zone. He showed me the speed camera photograph, which showed the front of the bike and rider only. He looked at my bike and my riding gear and after taking a few pictures on his phone indicated I would be receiving an infringement notice.
It probably was me in the photo - my motorcycle has been customised, and my helmet and gloves matched the photo. The photo however did not categorically prove that it was my bike. As it was taken from the front it did not show the number plate (which would confirm the identity of the bike). While my bike is unusual it is not necessarily unique - it is possible somebody else may have a similar paint job (for example they could have seen my bike and decided to copy the paint scheme).
Similarly as the face of the rider on the photo was not distinguishable due to a full face helmet it can't categorically be proven to be me.
In this instance is the law required to "prove beyond reasonable doubt", or simply "on the balance of probability"? If the former I will probably argue the case.
I unable to locate any information on the criteria for identifying a vehicle using the speed cameras. You may need further legal assistance from citizens advice bureau (CAB) or Community Law.