Nextdoor verifies each person's address by using one of four methods: credit- or debit-card number, landline phone number, mobile-phone number or by mailing a postcard that includes an invite code.

WSJ: Nextdoor Review: Social Network Brings Neighbors Together

Councillor Mike O'Brien, community safety spokesman, said the authority would be writing to all licensed gaming premises to invite them to meet the council and help to set up the code.

BBC: Betting machine