@
OjRaSo
Why have you made the assumption that you did something wrong?
If the light was on green, no offence.
If the light was going through the amber phase to go to red (which is not what you suggest) then not necessarily any offence committed because you are allowed to continue through an amber light if it was likely that stopping would be more dangerous.
Did you cause other traffic to alter course or speed? If no, then no worries there.
Was it a filter lane and you got confused with the filter lane changing to green before the main lights? Again, if its on a filter, not an issue, although this is what catches most people out and makes them think they have gone through a red light because of the conflict between the green filter and the red showing on the same set of lights.
So why you think you have done something wrong beats me.
If there was a camera, and you have got it wrong, then all you can do is wait a couple of weeks and see if the dreaded brown envelope drops through your letter box, but if you know the junction, you can pre-empt that by going and seeing if there are any cameras (traffic flow cameras are also found at junctions and are blue, ATS cameras are either solver or yellow) and if the Police had been there, they would have been inclined to pull you over at the time and given you a ticket there and then (assuming you had done something wrong) as it saves a lot of additional paperwork.