From Heathrow Terminal 1 train to Paddington (H&C Line)-Underground, Tube to London Liverpool St, train to Manningtree, then train to Harwich International. 2hrs 14min £42. From Heathrow Central Bus Station line 250 bus to Colchester Town Centre, Stanwell Street (Colch Bus Stn), bus to Harwich, Bus Station (Harwich Rail), then bus to Harwich International Port, Harwich International Station (Harwich Port). 4hrs 37min £21. From London Heathrow drive to Harwich International Ferry Terminal. 2hrs 20min £23.