SCART Socket

    1 --> Audio Right Out
Audio Right In --> 2    
    3 --> Audio Left / Mono Out
Audio Gnd --- 4    
    5 --- Blue Gnd
Audio Left / Mono In --> 6    
    7 --- Blue
Control Voltage --> 8    
    9 --- Green Gnd
Comms data 2 <-> 10    
    11 <-- Green
Comms data 1 <-> 12    
    13 --- Red Gnd
Comms data Gnd --- 14    
    15 <-- Red (or Chroma)
Fast Blanking --> 16    
    17 --- Video Gnd
Fast Blanking Gnd --- 18    
    19 --> Composite Video (or Luma) Out
Composite Video (or Luma) In --> 20    
    21 --- Shield
     

Seen looking in to TV. Signal directions are with respect to the TV.
Checked with diagram in Maplin catalogue.

See also SCART Signals and SCART Cable

More info at: http://www.sesworld.com/info/scart.html ,
http://www.par.univie.ac.at/~bob/video/scart/scart.html