Keep in mind that many (I think) of your listeners aren't that much used to British English, so by speaking somewhat slower you give us non-English people a better chance to hang on. I'm from Norway, btw.
But the speed wasn't the only problem, hut also the volume level and maybe the quality as well on Dave's track. When listening through headphones, I can obviously not turn the volume too much up, or the other hosts would burn a hole through my ears.
Well, perhaps I should be careful with the criticism, or you'll tell me to go record my own podcast, in "best" open source style.