After 3 tubes failing on me in less than 2 miles (2 went at the valve and 1 just wouldn't hold air) I need to buy some more.

I'm a little weary of buying cheap tubes as the ones which failed were the cheap on one tubes, but 5 tubes for a tenner is tempting. Had anyone bought them before?

And before people suggest, tubeless isn't an option

They provide a good service and a good range of tube sizes. Not had any problems with mine so far. For security you could go for a thicker tube (they do them). As for leaky valves not had any problems with my presta so far.