Traffic Lights

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I stopped at a red light at a box junction, and was second in the queue. The driver in front was not indicating.

When the light went to green, I saw my exit was clear, all but for the car in front, so I followed the car out in to the junction while the light was still green. However the other car stopped in the middle of the junction and put his indicator on only after stopping, to turn right.

He did not go until the light had gone amber, and the light was well in the red by the time I got to the other side of the junction.

First question is, if I entered the junction whilst the light was still green, but only got to the other side when it was red, could I get a ticket?

Second is, would, if I made the circumstances clear to the police, the ticket be cancelled?

Third is, if I did not manage to cancel the ticket, what sort of penalty, in terms of points and fine, would I recieve?

Thanks.