Hurray, I'm paying more tax. No really it's a good thing. The EU has made Amazon charge VAT on kindle sales at the rate of the country in which the SALE takes place. Last year if you bought my book on kindle I paid tax on it as if the sale was in Luxembourg. Now it's at UK rates.
Incidentally, Gone Riding is selling at £4.99 in the UK on kindle. I will see £2.80 of that. (The physical book is £13.95 - I'll get around £4 of that.)