overrun

What's the best way to place some kind of flap on the roof edge that drops into the gutter to prevent water running down back of the gutter and down the side of the building? Picture shows what we've currently got.

Hello All Can someone shead some light on my central heating please. The pump comes on for a bit after the heating goes off, here's what happens. I have a standard boiler pumped with HW tank, with a room thermostat for the CH also a programmer When the room thermostat calls for heat the pump...