Monitor a webpage for changes, get the contact info, and Pounce on that lead!
Monitor Planning Application approvals, get the contact details of the contractor/builder and pitch!
Job Listings show a company has a pain that needs solving. Your company could solve that pain.
Uh-oh...somebody got a fine or a violation or a warning. Act fast to reach out and help them.
Offer your legal services right when they are needed.