Answer:
Here's a good one on the Davis Services Group about "Growing a company by international aquisition"
http://www.thetimes100.co.uk/case-study--growing-a-company-by-international-aquisition--111-278-1.php
If that's not what you're looking for, The Times 100 have hundreds of case studies, so you're bound to find what you're looking for
Good Luck