Amazon has been voted the number one retailer in the UK for customer satisfaction over Christmas for the seventh year running. And to celebrate it has knocked £25 off prices of Kindle Fire tablets, including the Kindle Fire HD, Kindle Fire HDX 7 and Kindle Fire HDX 8.9.

The discount is applicable until Monday, 20 January and is subtracted at checkout when you enter the code MAYDAY25. A Kindle Fire HD can therefore be bought for £94 for the 8GB with special offers version. The Kindle Fire HDX 7-inch starts at £174 with the offer. And a Kindle Fire HDX 8.9-inch tablet can be bought from £304.

Amazon hasn't applied the offer to its already heavily discounted Kindle Fire HD 8.9-inch tablet. That currently costs £179 - £50 off its original price.

The retailer's number one position relates to a study published by analytics firm ForeSee. The ForeSee Experience Index: UK Retail Edition assesses more than 10,000 responses by customers, taken over November and December 2013, and scores them to see which offers the most customer satisfaction.

Amazon topped the list with a score of 84. You can find out more at