Hopkin Bevan gave the following account of events at Dyffryn, Gyfylchi, and Pyle:
Another very powerful revival took place about the end of 1806, at Dyffryn, in the parish of Margam. I remember that I had been given a Publication to be in Gyfylchi Chapel on the morning of the Sabbath of the 11th of January in 1807, and at Dyffryn for 2, and Pyle in the night. When the time came I did not know that anything had begun; but that brother Richard James had been in a house in the neighbourhood, one evening the week before, and the fire had started there, and when I came to the Chapel on the Sabbath morning, it broke out there so that it was impossible to speak for many minutes, and by the time I went to Dyffryn I was in the middle of it, and the fire proceeded to Pyle that night. This revival was very powerful in each of those places, and many were added to the Societies, in particular very many young people of all ages, and it continued very fervent for a time.
Bevan, Ychydig o Hanes, pp. 13-14.
With thanks to Geraint Jones
The Calvinistic Methodists met at this farm from 1780; I do not know if this was where they met in 1807.