I know what this is... To me this is indication of an update in mid october for the mac minis.
I would be faintly surprised if they update the mini before or close to the Mac Pro launch. Unless the Pro is
very expensive, the better Mini models are going to be in competition with the entry-level Pro, especially if the new Intel integrated graphics are all they're cracked up to be. Apple don't want people thinking too deeply about whether they really need dual GPUs and a Xeon...
That's because it's effected by more than just VAT. Local governments require different warranty programs that cost more/less money, local laws or culture increase the frequency/cost of lawsuits, local advertising will cost a different amount too.
More lawsuits than in the US? Inconceivable
A lot of the spats that get reported are just Apple getting their wrists slapped by government or industry regulators for misleading advertising - they don't seem to get that "our lawyer agreed the ad was technically accurate" just doesn't cut it in most EU countries. ISTR the warranty thing was mainly about the wording of the advertising rather than what Apple were actually offering. Often, the penalty is simply a public dressing-down and having to change the advertising, and even where there is a fine I suspect it is far, far cheaper than participating in the US national sport of litigation.
I'm sure that extra warranty and consumer protection requirements (e.g. the EU distance selling regulations are particularly pro-consumer) are an issue, although I have to say that, looking at comments of forums, US customers seem far more willing to buy stuff and return it on a whim.
However, I think a big issue is just economies of scale: whereas the English-speaking US market is a single, huge market for a single version of the product, EU and other markets are lots of comparatively small markets with their own localisation and support issues, like needing to stock 3-4 different keyboard types (although someone should teach Apple what a British keyboard looks like) and providing multi-lingual support.
Now, there might be an element of knowing that UK citizens are able/willing to pay higher prices than other regions, but if that is the case it's a much smaller dollar amount that simply looking at tax differences.
I recall the situation being much worse in the past - $1->£1 pricing back in the days when £1=$2, VAT was significantly lower (and less likely to be included in published prices) and there was no CE electrical regulation to comply with. I think that was one of the reasons why the Apple II never caught on in the UK to the extent that it did in the US - homegrown systems like the BBC Micro were half the price.