I implemented the majority of recommendations from Milo and also downloaded iPlayer Desktop. There was an improvement, and when I ran that test it gave me 4 green ticks. Not sure whether the tick means 'good' or whether it indicates completion of that section?
Perhaps I picked a bad time, but my one attempt to download to the desktop looked like it was going to take 20 minutes to get a 1 hour programme, so I didn't bother.
You will NEVER find RealPlayer on my machine (or Norton, or Mc, or......)