I did some walking around today and yesterday which was good. Quite a bit of time walking to and from meetings in the city. No issues with the Achilles hurting after or creaking. Might try a short jog tomorrow.
Have come to accept being on complete rest and am actually kind of enjoying it, although probably drinking too much beer as a result.
Main difficulty is that I can't actually identify anything as being wrong anymore as the creaking and pain have gone away entirely. More rest can't cause any harm though so I will continue to obey the doctors orders and continue to do pretty much nothing for another week or so. It will be quite difficult to stop myself running nationals though if there is no pain.
No pain in the Achilles bit the horrible creaking sound seemed to come back after riding home. I did ride hard because it was raining and cold but shouldn't have been enough to cause any problems. Back to the physio tomorrow so hopefully some useful advise will be given.