I think I have found a wasp nest in my loft. It fits descriptions I have
found on the web.

My hobby involves having several aerials outside the house that have to
come inside to various radios. They come under the roof via plastic
waste pipes let into the boards just under the roof tiles, at the eaves.
The nest is just next to the pipe, but in the loft, that only has 2
small coax cables coming through. I am certain it was not there a month
or so ago.

1 what material should I use to block entry through the pipes?

2 when should I tackle the removal of the nest?

3 when should I block the entrance off?

Dave