Charming and bullying, the Thomas brothers set about their plans for a New Trefelin.

The Thomas brothers begin trying to convince Trefelin to back their plan for a New Town, complete with new supermarket and surgery. Whilst suave Doctor Robert renews his acquaintance with his childhood sweetheart, Megan, older brother Basil soon has the village hall busy with villagers eager to exchange their house deeds as deposits for homes with all mod cons in the new development.

Aled and Daf decide they need to do something big to stop Basil's development plan, but Robert surprises Prem by offering him a central role in their grand new scheme. Prem tells Owen that he cannot work in the mine any more because of his health and, late in the day, a forlorn Megan calls at the surgery with some unexpected news.