Why did the British anaesthetist, Joseph Clover (1825-1882), have bank accounts in New Zealand?

Why did the British anaesthetist, Joseph Clover (1825-1882), have bank accounts in New Zealand?

Joseph Clover trained initially as a surgeon but, by the 1860s, was one of the foremost anaesthetists in Britain. He was one of only a handful of doctors who devoted his practice to anaesthesia at that time. I have been researching his life for many years since the...