IFR in a microlight?
No, but
201001181320 METAR EGMD 181320Z 22007KT 8000 BKN005 06/06 Q1025=
201001181250 METAR EGMD 181250Z 26003KT 5000 BR BKN005 06/06 Q1025=
201001181220 METAR EGMD 181220Z 32002KT 4500 BR SCT002 BKN035 06/06 Q1025=
201001181150 METAR EGMD 181150Z 36002KT 3500 R21/P1200 BR SCT002 BKN006
05/05 Q1026= is not really VFR weather.
It's OK for a very low scud run over the sea. However, he seems to have been flying at 3000ft. There is very little sounding data for 1200Z (Herstmonceux is missing) but what there is suggest he may have been above a fairly solid overcast.
I suppose that with such a low stall speed one could descend over the sea and put down on a beach somewhere.
It seems odd to be to be embarking on a trip to Australia and searching for the charts only a week or two before departure. There is a lot of planning to do on such a trip, especially once past the corners of Europe.