Sanity AU selling UK labels

I know Sanity stopped their physical shops a while ago and moved to online only. I noticed that Sanity.com.au is selling Arrow UK, 88 Films, Eureka and general UK release (with UK classification symbol on them) blu-ray & 4K on their site. Anyone know how long this has been going on? I wondered if they are sending from overseas distributor (like Zavvi.com.au does). Or if they are getting in some limited stock locally. Has anyone had any experience with getting UK boutique labels from them?