You have the benefit of hindsight and the luxury or knowing he was caught. All the mistakes he made are now pretty obvious but they wouldn't be to him at the time. There's a pretty accurate old saying by Robbie Burns “The best laid schemes o' mice an' men gang aft a-gley.”
I've no reason not to believe he didn't receive the call from NB. IMO whatever he did or didn't do thereafter would be capable of having some story weaved in such a way to implicate him.
What's important is the soc: casings, blood stains, distance of shots, gsw trajectories and wound tracks. These are things the perp was unable to control and show the prosecution case against JB is wrong.
And if he was trying to set the scene 'SC dunnit' why tell officers:
"No one appeared distressed and everyone appeared happy" when he left WHF:
http://miscarriageofjustice.co/index.php?action=dlattach;topic=5631.0;attach=4566I accept he was/is a numpty farmer from rural Essex but he wasn't that numptyish! He would say SC was in meltdown mode with mother in tears and father at the end of his tether and he was glad to get away.