Andrew,
Just looked at your images, very good, very effective, picture paints a thousand words as they say. Were these all done just using WFP? as I can't get satisfactory results just using the pole, it may be that the brush we use is too soft (vikan)
I also noticed on your gutter cleaning that one of the roofs is covered in moss, have you ever offered to do this for them?
We did one last year, using 7.5m pressure lance, not as bad as yours, charged them £400 and it came up gleaming. Just something to think about!
Ian