Pete,
Abridged from the FIH:
A- aerodrome
B- observation date/time
(For each runway):
C- runway
D- cleared length (if less than published)
E- cleared width (ditto)
F- deposits (nil, 1-9: damp, wet, frost, dry snow, wet snow, slush, ice, compacted snow, frozen ruts) for each third of total runway length
G- mean depth for each third of total runway length, in mm
H- braking action on each third of runway (1-5: poor-good)
J- critical snowbanks: height cm/distance ft, L/R
K- runway lights obscured (yes/no, L/R)
L- further clearance details
M- estimated time of clearance
N- taxiway available
P- taxiway snowbanks
R- apron
S- next planned observation time
T- remarks
Hope that helps!
Tocsin.