FNEL Centenaire Fleur de Lys #04: B.P. Mystery Cache

Lord Baden-Powell of 

A = Question « of ______ »  (second lettre)?
B = Birthday  (Day + Month)?
C = Beginning of the second Boer War (Year)?
D = Year and the name of the Isle where the first “Scoutingcamp”  (Year + First Letter)?
E = Name of his wife: (last letter)?
F = Death Date (Year) + Place of Death (Town) (First Letter)?

N= 49°41.(C+A+B)-1742

E=6°09'((F-D+E-5)*10)-53