An agency should leave you knowing who owns the next step
Before appointing a team, ask it to follow one enquiry from a service search to reception. Which part needs improving: discovery, the page, the form or the response? The proposed work should address that finding. Ask who will write, implement and check the changes, including work done by another supplier.
Request a sample delivery report with actual changes and a sample results report with evidence and limitations. Those are different things. A page going live shows work completed; it does not establish that relevant enquiries increased. Use our supplier comparison questions to make the conversation concrete.

