At first glance this might not seem like such a hot deal at £15.99 for an 8GB card but this looks to me like the peak of price/performance !
"As confirmed at digitalversus this card is the same as the newer extreme class 10s "Our lab tests proved our earlier suspicions. This 'new' card is nothing of the sort, and i simply a renamed Extreme III." http://www.digitalversus.com/sandisk-sdhc-extreme-16-gb-class-10-p388_7491_77.html
Looking at camerapricebuster it states the next best price is £44.99(going up to £88!). http://camerapricebuster.com/Sandisk_SanDisk_Extreme_III_SDHC_-_8GB_pc.html
I've spotted the card for £24.99 at RGB photo but this still makes the amazon deal by far the cheapest out there !
Having done a bit of research for my Nex 5 it appears it can handle about 18MB/s which makes this the ideal card. You might want to splash out on a 16GB card but you'll be paying 5 times more for only twice the capacity at £74.99 http://camerapricebuster.com/Sandisk_SanDisk_Extreme_III_SDHC_-_8GB_pc.html
From Tom's hardware's most recent SD Card reviews they say of the 16GB card:
"Lexar, Silicon Power, and Transcend all share second place when it comes to throughput. They all reach nearly 20 MB/s for reads and a bit more than 18 MB/s for writes. However, compared to SanDisk, they deliver less than half the minimum write throughput, which might be important for certain applications."http://www.tomshardware.co.uk/compactflash-sdhc-class-10,review-31878-10.html
If anyone can find this cheaper or recommend any other options post your finds !