Bloody hell, look at the gap between the tiles and the gutter !! And what's the "fence" for?
the fence is to stop things rolling from roof onto cony. I have a few holes from slipped tiles
Oh right, obvious now you say it lol
But the fence is causing more problems than good...
If you have a few holes from your slipped slates/tiles then I suggest you get your roof looked at mate.
... and if your in the south west, then I can quote you happy