Debbie bribed Ryan into robbing money from the safe at the bistro. Debbie then backed out and told Ryan in no uncertain terms the deal was off.
He whinged and whined and wheedled and talked her into letting him do it. He needs the five grand cash to start a dj business in Ibiza. Either Debbie or Ryan switched off a fuse in the fuse box to plunge the bistro into darkness so Ryan could rob the safe (no gloves on his hands).
Debbie took the bistro guests to the Rovers and said the drinks are on me.
Just as Ryan was sneaking out of the bistro (he should have been wearing a stripey jersey and a burglars' mask) Leanne came in, sorted the lights and Ryan sneaked under the bar then popped up pretending he had just got there.