Hmm.
Aviation Digital Data Service (ADDS)
Output produced by METARs form (1812 UTC 10 July 2008)
found at ADDS - METARs
METAR text: EGSS 101750Z 22018KT 9999 FEW035 18/11 Q1005
Conditions at: EGSS (STANSTED AIRPORT, GB) observed 1750 UTC 10 July 2008
Temperature: 18.0°C (64°F)
Dewpoint: 11.0°C (52°F) [RH = 64%]
Pressure (altimeter): 29.68 inches Hg (1005.0 mb)
Winds: from the SW (220 degrees) at 21 MPH (18 knots; 9.4 m/s)
Visibility: 6 or more miles (10+ km)
Ceiling: at least 12,000 feet AGL
Clouds: few clouds at 3500 feet AGL
Weather: no significant weather observed at this time
If it's so easy, why does this translator make a patently invalid claim about the ceiling?