These are the 14 lists extracted from the BNC master list and lemmatised by Paul Nation, and used (in a slightly different format) by the BNC version of VocabProfile.

BNC 14k Lists

basewrd1.txt
basewrd2.txt
basewrd3.txt
basewrd4.txt
basewrd5.txt
basewrd6.txt
basewrd7.txt
basewrd8.txt
basewrd9.txt
basewrd10.txt
basewrd11.txt
basewrd12.txt
basewrd13.txt
basewrd14.txt