You may find pencil skirts by Burberry's different lines at Net-a-porter and My Theresa :
BURBERRY PRORSUM
Ruffled crepe pencil skirt / Ruffled tweed skirt / TWEED SKIRT WITH RUFFLED TRIM
BURBERRY PRORSUM
GLENCHEK PEPLUM SKIRT / BOUCLE SKIRT WITH PEPLUM TRIM
BURBERRY PRORSUM / BURBERRY BRIT
Tinsel-striped pencil skirt / Coated-denim pencil skirt
BURBERRY LONDON
Stretch-crepe pencil skirt / HIGH-WAISTED PENCIL SKIRT