How tall is Robert James Collier John Peck | February 02, 2026 Robert James Collier's Height6ft 1 (185.4 cm)English actor, best known for playing Thomas Barrow on TV series Downton Abbey and Liam Connor in Coronation Street.Photo © s_bukley / DepositPhotos.comDownton AbbeyCoronation StreetRobert HeightsAverage Guess (16 Votes)6ft 1.53in (186.8cm)