So this morning I installed Monkey and the editor on my daughters Macbook and everything worked perfect.
I had a bit of breakfast then tried it on the PC and no go, I went around the houses of maybe it was an earth loop, butchering a USB extension cable to remove the earth all to no avail.
Finally I decided to try it on the Mac again and it didn't work, the Mac needed charging so I turned the pod off for a while then tried again and it worked! I gave it another ten minutes to cool down then tried it on the PC and again it worked!
My conclusion is that either the Pod or the PSU are going faulty when they warm up, A local electronics chain has a suitable PSU in stock and they have a 30 day return policy so I'm going to get one and give it a go.
I'll keep you posted.
Craig