Ahh - Virgin accounting - many years ago the Economist published an investigation into that subject.
Sir Richard's Empire has a multitude of brands across a vast number of industries and even more companies and countries. They all do a great deal of inter-company business. At the time it was remarked that many of them have different financial year ends.
It seemed to be considered rather opaque and impossible to get a full view of what the situation really was.
A masterpiece of financial engineering.