The maths are little bit out on this one so far and it's not as bad as it first appears for the UK.
The pre-tax price for the PS4 in the USA is $399 which is £256. The pre-tax price in the UK for the console is £291, or $453 (£349 / 1.2). The difference is £35, give or take, most of which will be absorbed by the higher costs that retail businesses face in the UK compared to the States (fuel, warehouse space, business rates etc., etc.). I imagine the retail margin on the console is pretty much identical between the two countries.
There is also currently no import tax (as opposed to VAT) on games consoles from China. Sony will also have to hedge against currency fluctuations as they can't keep chopping and changing the price every time a currency moves against another.
Compared to some of the prices I've seen posted above from other EU countries, I don't think there's any reason to complain about Sony's UK pricing. If you want to complain to the government about taxes, I think there are better places to start.... VAT (intended for luxury goods) on electricity and heating fuel anyone??!!