Unknown badge, Hong Kong, May 1918

[gwulo]

Hello, I'll be grateful if anyone can help identify this gentleman's badge:
http://gwulo.com/node/9305
(There's a slider below the photo that lets you zoom in - but it's not great detail unfortunately.)

You can see the full photo it's been cropped from at:
http://gwulo.com/node/9270

The man on the right of the full photo has been identified as RMLI, but no luck yet with the one on the left.

Thanks & regards,

David