Thanks for posting that link Steve, it may be very helpful in the long run. I've decided that I'll at least have a try at doing it myself and see how I do. My main concerns are the ladders as they are wooden ones and quite heavy but I have used them on three of the gutters I have and I've managed ok
The other problem is that the gutter is over a very long conservatory but I do have drain rods that may overcome this problem, we'll see what happens