I am very surprised to find out his profession! call me old fashioned, but I thought it quite disrespectful of him to be walking with his hands half in his pockets when they went to lay the flowers..... also on Facebook, a lot of Joanna's friends had changed their profile pictures to either the 'Missing' poster or a 'Lily'..... he was posing in dark glasses....in fairness he may not use his F/B that often and just didn't think to change it.
I dont think he got that directly involved, just changed the time that GR arrived, maybe GR said along the lines of....'look bruv, I dont want them pinning this on me, can you just say I got here a bit earlier.....' I dont think the wife is covering, she doesn't know exactly what time he got there, she was asleep.