METAR around the time of the accident, being worse even than the revised TAF.
METAR EGBJ 081250Z 05003KT 3500 -DZ BR BKN006 OVC010 02/02
Q1021=
Less than ideal for a SEP IFR flight even if that is what was planned. On those forecasts it would be very easy to get suckered into departing VFR for a familiar route and getting caught well short.