Identification Chimney removal

Hello.

I'm new to this site and would like to ask if anyone has completely removed their Chimney stack, from the living area to the roof.

I live in a BISF house and I have removed most of it already, right up to the loft, so all that is left is the outside roof chimney.

Can I completely remove that as well ? or shall I just leave it.

Many thanks.

Sie.