The mortar between the roof tiles and the asbestos undercloak at the
gable ends of the roof has suffered over the winter with the outer 4/5mm
falling out in some instances. Do the plastic end caps I've seen on a
few houses offer any protection against this kind of frost damage?

Anyone able to tell me how they are fixed (the bargeboard is uPVC)?

Do I need to repoint before fixing them?

Do they come in different sizes?

Oh, and what's their correct name (really don't want to go into a
suppliers and ask for some plastic end cap thingys for a roof!

TIA

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F