+1 for bulk deals from Ribble, the Contis are good. I've also had Vittoria and Michelin.
I'm still working my way through the last box of 10 Contis which suggests they're pretty good.
Cheap patches from Inmotion are also good (pack of 100 for £6.25, also double ended allen keys 5/6mm for 80p and huge tubes of puncture repair glue 40p, proper cable cutters for £16 etc. etc.) http://www.inmotionproducts.com/
**Don't buy chinese rubbish **(Specialized branded for example), they are crap.
Decathlon tubes look like a bargain, until you use them - also crap.
Doesn't everyone get their tubes made in Taiwan/China ? Wouldn't be surprised if they all came from the same factory
Doesn't everyone get their tubes made in Taiwan/China ? Wouldn't be surprised if they all came from the same factory