Before and after.

This is the result of yesterday's "Man dancing on roof"
It, certainly, looks a whole lot better after than before.
"They" say it is rather "Gortex"-like in that it "breathes" yet keeps the water out and, supposedly, there's a bonus in that it claims up 25% reduction  in heating bills.
In fairness I ought to point out that the guttering was fitted at two different times, by two different firms for two different owners.
:¬))