Check one existing client before you propose another project.
I build a light outside-in picture of the client business, compare it with your current scope and return one or two business needs worth testing.
The client, your current scope and enough context to understand the relationship.
Send the client website, what you currently provide or have implemented, and any account facts you want included.
I do not need access to the client's systems for this first-stage check.
A short Client Situation Note.
A working business snapshot, the relevant current scope, one or two possible unaddressed needs and the questions that would confirm or reject them.
I state where published evidence ends and inference begins. If I do not find a justified question for the client, I say so.
Light by design.
The £99 check is for testing whether this type of client-side analysis is useful to your account work. It does not attempt to exhaustively model the client or produce a full account strategy.
If the account warrants deeper work, the Client Situation Review expands the analysis.