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 23min £41. From Heathrow Central Bus Station line 250 bus to Colchester Town Centre, Osborne Street (Colch Bus Stn), bus to Dovercourt, then train to Harwich International. 4hrs 23min £29. From London Heathrow drive to Harwich. 1hrs 53min £26.