I'm pretty sure that our British friends will know all about Britannia. From what I've learned, Britannia was a goddess figure in the Roman empire several hundred years ago. Eventually, after the fall of the Roman empire, Britannia was used as a symbol of the British navy.
Now I have to wonder what is Britannia doing in Long Street, Cape Town? I'm pretty sure that this status must have it's origins in the time of British colonial rule of the Cape Colony. If you do happen to know what she's doing in Cape Town, please do let us know.