2 or 3 minutes whilst this dick was in the house, or after he made off?
The reason i ask, the same happened to a friend of mine. The police turned up sharp as the chap was still trying to break in. Dog handlers too!! (for tracking)
If the chap had left the scene, then the police called, then an area search for the dick head should of done surely and your sister called on for reasurance and to make a report, ie statement, SOCO called for dusting up, house to house inquires etc..... All on the same night. It was only 11:30ish so not late really!
Who says the MET is the best force!!