When the iPad mini with Retina Display first launched, here in the UK there was no initial reseller availability – as indicated on the GSX portal. It was either Apple or don't get one, but thankfully that seems to have changed with several major retailers now offering Apple's latest. However, if you're wanting a 4G LTE model then you'll be looking much, much harder, as it seems that WiFi only is about all that's available in a lot of places right now.
There's also a mixed bag of how you can get your new Retina iPad mini. For example, Currys will let you reserve online for in-store pickup, while Argos is currently showing home delivery only on its website. The best thing to do as always, is check with whichever retailer is closest to you. Supply is pretty tight, but at least there's now a wider scope on where you can snag one here in the UK.
Have you managed to pick up a new Retina iPad mini from a UK based Apple reseller? Let us know in the comments what you got and where you got it from!