Colour-Coded UK ASM Map

I need a clear, professional map of Scotland, England and Wales that shows, by postcode area, which of our Area Sales Managers looks after each customer. I already have the postcode-to-manager list; what I’m missing is a visually engaging, on-brand document that can be emailed straight to clients... (Budget: £20 - £250 GBP, Jobs: Adobe Illustrator, Adobe InDesign, Adobe Photoshop, AutoCAD, Data Visualization, Graphic Design, Microsoft Word, Print Design)