Collecting possessions from UK

Just reading this thread. Did you bring your belongings over? We are within the 12 months of moving date, but only just. Going to collect a carload of personal belongings in September and know about the cerfa doc and inventory x 2 but not sure where we have to show these documents if we catch the Eurotunnel. Does anybody know whether we hand it to someone in Folkestone or is it Calais?