Can you land or depart? If not why not? (Heavy Iron did)
Taf egmc 300806z 3009/3018 24005kt 0300 fg ovc001
prob30 tempo 3009/3012 2000 br sct004
becmg 3012/3015 5000 br bkn005
prob40 tempo 3015/3018 1000 bkn002=
It is a TAF and for planning, but decision to land or depart is based on actual weather and METAR.
Land or depart are also two different things. You start on METAR conditions, but it depends on companies SOP wether you are allowed to start with such TAF at your destination, especially upon discussion on prob30 sufficient or not. If you take off and prob30 does not hold, the company may have an audit discussion on their SOP parameters and the principles of flight preparation.
As always, in the end it all depends ... let us look into details, this is Southend and an early morning TAF, of which we know they are not highly reliable, and we have one of the special seaside early morning conditions. Wind 240 degrees at 5 knots will quite often blow the fg fzfg away and weather stations tend to cya, so the actual weather conditions can maybe expected better than TAFed, which is a final judgement different from pilot to pilot experience with the place. I did not look up the general weather chart for the date in question, but there may have well been patches of weather with enough holes to punch heavy iron through, hard to tell without having been there.