On a FB shout someone mentioned the lack of cast info at the venue(idk if they could have bought a programme)

folkradio.co.uk gives this as
The Cast

Henry Cabell: SEAN COONEY (The Young'uns)

Susannah Holmes: RACHAEL MCSHANE (Bellowhead)

The Father: PAUL SARTIN (Faustus/Belshazzar's Feast/Bellowhead)

The Mother: NANCY KERR

The Narrator: MATTHEW CRAMPTON

The Turnkey: GREG RUSSELL

Abe Carman: DAVID EAGLE (The Young'uns)

The Shantyman: SAUL ROSE (Faustus/Waterson: Carthy/Whapweasel)

The Jailer: BENJI KIRKPATRICK (Faustus/Bellowhead)

The Coachman: MICHAEL HUGHES (The Young'uns)

http://www.folkradio.co.uk/2017/01/documentary-the-transports/