Thanks ladies, I'll pop off to asda and sainsbugs and see if either of them are any good then.
The problem we have with the nappies is that the new ones don't seem well fitted enough around the inside of the thighs, and poo leaks out (both of mine do fairly liquid poos unfortunately).
Oh well, maybe it will give me the impetus I need to potty train DD (2.5) ... !