If I had money then I would bid but I haven't
unless you'll take £60 for it ?
Anyway some ideas for you :
UK exacts on old GKT >
Mirror 300,000
Mirrors 135,000
Mirror newspaper 27,000
Given that the non plural tends to get searched for more than the plural then I would say that the mirror as in the reflective product gets searched for more than the term mirrors, now look at the exacts for Mirror newspaper at 27k, I think you can safely say that mirror as in the reflective product gets searched for at a bare minium of 200k UK exacts per month.
Good luck and let me know if you will take £60 ?
Thanks