If the price was a mistake, they would have said something by now. So it is safe to say the UK version is £129.

As for people asking for the reason behind this, you will not get a reason, because the reason is simply 'thats what we can sell it at and people will buy it'. SE's Financial/Marketing departments aren't about to show you their figures. They are going to make a hefty margin on this and that's the end of it.

So there you go. If you feel the CE is worth the price tag, go for it, if not then don't buy it. Sadly at this point there is nothing left to be done.