Sarking felt and new flue

Had a new boiler relatively recently and the new flue went through a new hole in the roof.
What should have been done with the original sarking felt? It appears a hole as been crudely cut and it is left hanging around the flue.
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Quite normal, as one roofer told me it's the slates/tiles that keep the wet out the sarking is only backup. The boiler fitter should have fitted a collar to the flue to cover the hole from the missing tile.
Richard
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There is a tile sized plate with a collar.
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On Fri, 11 Oct 2019 04:50:49 -0700 (PDT), Tricky Dicky wrote:

a

appears a

What sort of sarking and does the flue get hot?

True enough but if anything does get through above the flue it's going to end up inside the roof...

The sarking on the "up hill" half of the collar should be above the collar flange. Sarking on the "down hill" half of the collar should be below the flange. So anything comeing down is lead onto the flange then onto the sarking below.
--
Cheers
Dave.
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