Churchill -- Man or Myth?

Supposedly, 23 percent of (take your pick) all British people or British 
people under 20 believe that Winston Churchill was just a myth.

http://www.telegraph.co.uk/news/uknews/1577511/Winston-Churchill-didn't-
really-exist,-say-teens.html

http://uktv.co.uk/gold/stepbystep/aid/598605

UKTV sponsored the study, and the only bit on their website doesn't say 
anything about kids being asked, but it does say it's based on 3,000 
responses.

Doesn't that number suggest it's not a scientific survey?  The survey goes

on to say that 58% believe Sherlock Holmes was real -- this is getting
even 
more bogus sounding.  It goes on to list "Top ten fictional characters
that 
the British public thinks are real" with #5 being Mona Lisa -- except she 
wasn't fictional....

I couldn't find any debunking of this survey, but has anyone else found 
something?