Dr S, 
I rendezvoused at Blue Nord with a mate, and although our two journeys were very different, our journey times were almost identical,  as I think you're based in the NE somewhere it's a good comparison.
I left London at about 6am on Friday morning, driving to Calais for the tunnel and arriving at LM just in time to pick him up at the tram stop at Tetre Rouge at 3 in the afternoon. He'd left Edinburgh, also at 6am, with a flight to Paris CDG, transfer to the TGV to Le Mans and finally the tram.
And I'll admit, he was in much better shape than me.
H