I've moved into a new house which has "privacy" door knobs on many of the rooms, which are really annoying because they keep locking when they're not supposed to, and need to be opened with a screwdriver. They also make the house look like student digs. I want to replace them with something smart. My local big-chain DIY store has "designer" satin nickel mortice knobs for £15 each, but they don't look much different to some I've seen on Amazon for little more than a fiver. I don't really have an eye for these things, so I'm hoping to get some sage advice from those of you who know your doorknobs!