Rolls-Royce vs fox's socks

Rolls-Royce

noun
  • A car made by this manufacturer. 

  • Anything that is the best of its type; the best quality product possible. 

name
  • any of several British companies that make motor cars, aero engines, etc. 

fox's socks

noun
  • Something or someone that is ideal or very pleasing. 

How often have the words Rolls-Royce and fox's socks occurred in a corpus of books? (source: Google Ngram Viewer )