I've never seen one, still live in hope and have plenty more life left in me to see one. I'm only 22 after all.
Hopefully I'll make it down to Goodwood for the FOS or something soon, there's usually an F1 to be found there. Just a shame it's right at the bottom of the country and I'm in the north west. I should probably make the effort though.
Regardless, the effort of people on here to document the cars and to get pictures of them means I don't dwell on the fact I haven't seen one. Constantly amazed at the findings on here and it more than keeps me entertained.