Unable to identify mark - help please

I have an excllent silver cigar case, I detect from the marks it was made in 1933 in London but I can find no information for the mark on the left of picture attached. Can anyone help please?

This is the mark of George Howard Hicklenton and Stanley Phillips first reistered in 1930, but no longer registered.
Hope this helps.

John, many thanks, that is most helpful. Were they renown? Do you know of any webpages referring to them?