You do not need a technical brief. Start with the ordinary-language version of the problem.
What is frustrating customers? What are staff repeating manually? Which spreadsheet has become far more important than anyone intended?
What is happening now, who it affects and why it is becoming frustrating or expensive.
The tools, spreadsheets, emails or manual steps your team currently uses to get the work done.
What you would like customers or staff to be able to do more easily.
Anything that must stay under human control, connect to an existing system or work within a particular budget.
Email is usually the best place to begin. I am based in Bournemouth and work comfortably with businesses and teams across locations and time zones.
Email Chris