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The media only tell you the results for the people who know who they support.
When you look at the raw data tables,the results are:
Cons 33%
Lab 26%
Lib Dem 10%
Brexit 2%
SNP 4%
Won't vote: 9%
Refused to say: 4%
Don't know: 13%
But when it comes to the media, they only tell you those who know who they support.
Then there's also the issue about margins of error, weighting issues etc.