Where's my doppelgänger?

4 times this week new business contacts have been absolutely convinced that they've met me before because I look so familiar! 4 times!

I know I've got lots going on but I'd like to think I'm pretty good with faces and generally I know if I've met someone before, even if I've temporarily forgotten their name.

Anyway, I don't know about you, but this happens to me. A lot.  

Either I have a very common face and look like lots of people or (and this is slightly more exciting!) I have a doppelgänger!  

So, if there is a Vicks Ward double out there, how do I go about tracking her down?

Suggestions please on a postcard....