ivor4781
Buried in another thread on this subject, someone (sorry can't remember who) said that a jury cannot spend less than one hour deliberating.
That leaves 30 minutes, which is time yo file out of the room, take instruction, elect a foreman, vote, then file back in.
Regarding why they were tried when the evidence was for all toq see - well, that's the British judicial system. All the evidence has to be heard for the judge to weigh up and decide on a sentence.