Over the past few days we have been looking at how we might solve:
VKMHG QFVMO IJOII OHNSN IZXSS CSZEA WWEXU LIOZB AGEKQ UHRDH IKHWE OBNSQ RVIES LISYK BIOVF IEWEO BQXIE UUIXK EKTUH NSZIB SWJIZ BSKFK YWSXS EIDSQ INTBD RKOZD QELUM AAAEV MIDMD GKJXR UKTUH TSBGI EQRVF XBAYG UBTCS XTBDR SLYKW AFHMM TYCKU JHBWV TUHRQ XYHWM IJBXS LSXUB BAYDI OFLPO XBULU OZAHE JOBDT ATOUT GLPKO FHNSO KBHMW XKTWX SX
By various means we discovered that the key was 6 letters long, and by two methods we determined what that key was. The key turned out to be 'Womble'.
BEAUF ORTAN DVIGE NEREB ECOME MUCHE ASIER TOANA LYSEW HENTH EREIS ALOTO FTEXT TOWOR KWITH THISA LLOWS USTOU SETHE REPEA TINGN ATURE OFTHE KEYTO OBTAI NMANY VALUA BLEST ATIST ICSON CETHE LENGT HOFTH EKEYI SASCE RTAIN EDORP ERHAP SGUES SEDAT THENG ROUPS OFLET TERSA KEYLE NGTHA PARTC ANBEA NALYS EDASI FTHEY WEREA CAESA RCIPH ER
Reformatting this, we get: "Beaufort and Vigenere become much easier to analyse when there is a lot of text to work with. This allows us to use the repeating nature of the key to obtain many valuable statistics. Once the length of the key is ascertained or perhaps guessed at, then groups of letters a key length apart can be analysed as if they were a caesar cipher"
Actually, with Beaufort the groups of letters are a combination of atbash and caesar.