and another thing....
.....the software my mate used is also a free download and he did the recovery from the camera disc in his card reader. There were an unbelievable number of "unrecoverable" files, which we presume are previously overwritten files as the camera has been used extensively over the three years we've had it and it has been "emptied" several times. The SD card has now been re-formatted so we're starting with a clean set up before our trip to la belle France in a couple of weeks time.
The Ancient Mariner