As the website of English banknotes dealer PAM WEST indicates it, The Bank of England has printed 440 milion new £5 notes prefixes AA to AM, that is to say about 60 million banknotes of each prefix.  All prefixes are therefor common.  The only ones worth money are those listed above and special serials, like 123456, 333333, 888888, or similar.

Numbers starting AA01:

The most valuable notes begin with AA01, the first batch to leave the presses. At a Bank of England charity auction, a note with the lowest publicly available serial number, AA01...