Chloe: it hasn't made much difference as I've always been paranoid about closing windows and I keep the doors locked at all times even when I'm home! They got in by removing part of the window, it was an old-style wooden one so we're having most of the remaining wooden windows replaced with double glazing. We've also had help from the Crime Reduction people who have replaced our front door lock and fitted additional door and window security throughout the house.