what do you mean plead your case,you got caught going through the lights,you will be offered a fixed penalty and 3 pts,if you foolishly decide to go to court to plead,you will most probably get fined more for wasting the courts time,unless you have very strong mitigating circumstances,ie rushing your wife to hospital for birth etc,other then that i would not bother,the photo proves you are guilty.the court may take a dim view of you pleading,also depends on how many points you allready have.