Most chimneys have some kind of cranked or blocked bit like louvers to stop
rain coming straight down or birds building their nests there.
I'd have thought a camera on a mast poked through from inside the loft
with a tile removed might be another way of doing it.
Brian

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The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
Harry Bloomfield; "Esq." wrote in
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Clive Arthur submitted this idea :
Any such thing around? USB would be good, maybe it's a little too far.

Wifi camera and maybe a cover which could be tugged off with a string once
up there?