Those who are interested may want to revisit my 'In Keswick, 40 Miles Done' post. With the aid of a few Linux commands I have managed to rotate my first video 180 degrees and have just now published it as an addition in that post.
Quality is not as good as the others due to the processing but it is acceptable. It was the first of my route videos, and my inexperience with the camera shows. I had intended to take more than one shoot on that day but, forgetting that the camera went to sleep after any extended idle period, I failed to awaken it and assumed it was recording. So, alas, only one video.