Yes usually you can get it from any of the British shotgun companies. Do a search on the internet It would be Holland and Holland or Wesley Richards would have it.
Hey there
I was curious when I saw you looking for Rangoon Oil so I looked it up and it show that it is used on your skin. The link to Amazon show skin treatment. Are you using for firearms or your skin?
Westley Richards, moved on to their Trade Secret Silicone oil, about $10 bucks for a 30ml bottle. The boys ain't been haulN Rangoon oil up the rope since WWII broke out.