Recently travelled through LGW, LTN and today STN. STN definitely the least pleasurable. Security still really badly designed and managed. Nobody putting empty trays away so everything getting held up. Followed by that repellent walk of shame through duty free.
My wife also came through yesterday. Massive queues at immigration.
It's actually my most convenient airport and i used to love it. But now I avoid it if possible because STN + FR = unpleasant