We visited the relatively new Ikea in Southampton last year out of curiosity more than intent to buy.
The entrance was at the top of the multi storey building so you have to go to the top using lifts and staircases that are outside the main building. Once you are inside the one-way system steers you away from any exit until you reach the bottom floor.
Another deliberately confusing and mind numbingly stupid Ikea Policy is their stock layout. My wife wanted to look at their mattress protectors (those padded things that fit beneath the bottom sheet and smooth out the top of the mattress) when we looked for them on the store guide there were three different types on three different floors so to compare them we would have to go up and down the place several times. Madness! We decided not to buy anything and look for the way out, during this process we both suffered from exhaustion and I temporarily lost the will to live. When we finally got out and got back to the car to sit down and recuperate we resolved never to visit the place again. Ikea should realise trapping customers is a bad idea, it is like they have kidnapped you and during your escape attempt they expect you to buy something. In my opinion if you consider visiting one of these retail nightmares you need to be well equipped and roped together like mountaineers. It would also be a good idea for Ikea to give every customer a motorised scooter as walking around the place is so tiring.