Absolutely, we both have our windows open, and as with most converted houses the soundproofing is poor / nonexistent.
He clearly doesn't realise the sound travels.
Someone will phone up ordering different types and amounts of tobacco which I think is safe to assume is drugs...
The Albanian guy in the flat below me I can hear on the phone regularly setting up drug deals, along with a mountain of letters I am reviving for unpaid bills and parking fines so would tend to agree.
The streets: https://www.ticketmaster.co.uk/event/1F005F81C59D5DA6?did=sjmthestreets
Also busted Sunday: https://www.ticketmaster.co.uk/event/1F005F52E5AF510F?did=uksjmsbusted