Currys have 2x16gb class 10 SD cards for £19

But then 16gb Transcend class 10s are just over 9 quid each at the moment.

I was quite impressed with the Currys price because I was able to buy locally (and on the day I needed them), I'm assuming the transcend price is online?

Yes, online.  I see your point about buying locally but unless you're out shopping (hate it) and pass a Currys then the cost of getting there, parking and so on make it cheaper to buy online even if its dearer if you see what I mean.

Currys do seem pretty competitive! We`ve (I`ve) just treated my self to a new TV, a Samsung series 8 3D TV & Currys were the cheapest I could find on the high street & only £10.00 dearer than online!

Worth noting they are the Sandisk "Ultra" range - at sites like "MyMemory" you can get the far higher performing "Extreme" range (quoted at 45MBs -  or 360Mbs) for only a couple of pounds more at the moment: http://www.mymemory.co.uk/SDHC/SanDisk/SanDisk-16GB-Extreme-SD-Card-%28SDHC%29-45MB_s---Class-10

Amazon looks preety neat too! £16.79 . . . SanDisk Ultra 32GB UHS-I Class 10 SDHC Memory Card 30mb/s

http://www.amazon.co.uk/dp/B007BJHEWK/ref=asc_df_B007BJHEWK11461618?smid=A3P5ROKL5A1OLE&tag=hydra0b-21&linkCode=asn&creative=22206&creativeASIN=B007BJHEWK&hvpos=1o1&hvexid=&hvnetw=g&hvrand=16309873241861241018&hvpone=&hvptwo=&hvqmt=

and for a few £'s more you can get this

 

http://www.amazon.co.uk/gp/product/B004Q3C98S/ref=sr_1_9?ie=UTF8&qid=1358158300&s=computers&sr=1-9

 

Harry