Sir Timothy is expected to visit Lark Rise from London to view the locals' mummers play but only Lady Adelaide shows up. The play goes ahead, with Queenie, who has temporarily left Twister to teach him a lesson, upstaging her husband, but afterwards Lady Adelaide confesses to Dorcas that she had a short fling, now over, with another man, causing a rift with Timothy. She assumed he had returned to Lark Rise to seek comfort with his old flame, Dorcas, hence her visit.
—don @ minifie-1