I've just ordered one of these for myself, my Find 7a has the yellow tinted screen fault and will be going back shortly for a refund.
This is £314.99 from Amazon UK, probably the cheapest in the UK is PrePayMania at £307.98 (minus their 5% Quidco).
This is the EU version with LTE so is exactly the same as that from Amazon UK except that it might need a 2 pin adaptor for the charger. I believe Sony warranty is EU wide, if not you have 12 months I guess with Amazon.de. Amazon are very decent at returns etc.
A bargain at £245.98 or 307.31 Euros.
I used a zero commission card to pay so I don't know how Amazon's conversion works out if you want to pay in GBP, it will likely be a pound or two worse.
307.31 is with the shipping, the price listed on the site for just the item shipped within Germany is 299 Euros.
Black is £12.46 or 15.59 Euros more. Only the back is a different colour so it probably isn't worth paying for if you're putting it in a case.. just buy a black case if you want black!