As far as I know, it goes like this:

Going to Brussels on Tuesday 24th May, then down to Auderath on Thursday 26th May
Steve & Laura
Martyn

Going to Auderath on Thursday 26th May
Nige & Joe
Tim & Sim

All the others will be on the 8.00am ferry on the Friday 27th May

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Then coming home, everyone except for Nick & Sian on the 8.00pm ferry from Dunkirk on Monday 30th May.