I live in the UK and work in a store, 28 Kinect units in the storeroom, along with loads of 360s. both have filled up their respective spaces in the storeroom. Wii and PS3 are completely empty, however there is a few Wii fits in the storeroom.
although i'm not sure that i can represent every store in the UK, from what i've seen it dosent seem out of stock here, not even close.