Born on 26th August 2007, Arthur Thomas is the biological son of Ashley Thomas, the local vicar, and wife Laurel. However, an accidental baby-swap sees him being given to Greg and Melanie Doland, who gives birth nearby on the same day. Their biological son, Daniel Thomas, dies of cot death on 21st February 2008. Laurel's mother Hilary Potts soon starts to think that Arthur is not Greg and Mel's son, and eventually DNA tests prove this. After a court decision, Arthur is handed over to Ashley and Laurel in June 2008. Arthur then refuses to eat and Mel comes round and helps out. Eventually, Laurel bonds with Arthur, and Greg and Mel leave the village.
- Arthur is allergic to sea-food.
- Arthur's first credited appearance was in Episode 7379/7380 (24th December 2015), although despite appearing in subsequent episodes he was not credited again until Episode 7409 (27th January 2016).