The problem with one adviser per country
A group filing in the United States, Canada, India, the United Kingdom, the UAE, Singapore and Australia typically holds seven engagement letters and receives seven unconnected opinions. Each is defensible locally. Together they often describe the same profit in incompatible ways, which is exactly what an auditor looks for when they open a file.
We hold the consolidated position instead. One team sees every entity's return before it is lodged, so intercompany charges, treaty claims and permanent establishment conclusions say the same thing in every country.