A useful local SEO report shows calls, form enquiries and direction requests first, then map pack and organic visibility for the searches that matter, the work done that month and the plan for next month. A report that only lists keyword positions tells you very little about the business.
Calls and enquiries should come from tracking you can check, such as Google Business Profile insights, call tracking and Google Analytics.
Visibility should cover the towns you serve, because map pack rankings change street by street.
The work log matters too. If a report never says what anyone actually changed, ask what your fee paid for.
Useful pages
This is one part of a bigger picture. Local SEO services in the UK: the full guide covers what local SEO includes, costs, timelines, agencies and red flags in one place.