When the Boat Comes In S04E06 - Friends, Romans, Countrymen

Jack has been living in London for three years with Imogen. She leaves him to avoid scandal as her aunt is standing to be Labour MP for Gallowshield. Tipped off about oil by Geordie Watson, Jack buys cheap land in Gallowshields to sell to the interested company. At a toga party given by Mrs. Laurence for the Tyneside hunger marchers, Jack meets Jessie. Although still married to Arthur, she is seeing upper class socialist Robin Cunningham. She opposes the land deal, but Jack buys her silence by threatening to tell Arthur about Robin.