British Council’s 2022-23 annual report is now available. I believe it covers the twelve months ending March 2023.
British Council delivered 1.8 million IELTS tests in this period, a 12 percent increase from the year ending March 2022. Compare that to IDP’s most recent annual report, which mentioned just a 1% increase in the volume of IELTS tests delivered (and, notably, a 5% decrease in testing revenue in India).
Remember that BC doesn’t do IELTS in India nowadays (they ceded that market after selling their interests there to IDP in 2021). It looks like ROW is a growth market for IELTS, while India is somewhat flat.