There are quite a few original copies. I remember Ross Perot saying he bought a framed original. Instead of having it shipped, he just put it in his suitcase. At the airport one of the customs officers had him open his suitcase, and asked what he had.
“It’s the Magna Carta.”
“Oh. Very well, carry on.”
There are only four 'true originals' (from 1215) including this burnt one. Ross Perot owned a copy from 1297 - which is the version that is still considered part of English law in a technical sense (nearly all the provisions have been modified by later laws, but it's still 'on the books' as applying in any case where it wasn't modified.