"Mouldy Old Dough" is an instrumental single, which was a hit for Lieutenant Pigeon. It was written by Nigel Fletcher and Rob Woodward and first produced by them under the name of their other band, Stavely Makepeace. Recorded in the front room of Woodward's Coventrysemi-detached house, it featured his mother Hilda Woodward on piano, in a boogie-woogie, honky-tonk, ragtime style. The only lyrics are the growled title "Mouldy Old Dough" and "Dirty Old Man" by Fletcher. When Fletcher asked what they meant, their author, Rob Woodward, said he had no idea. Despite initial disapproval from their long-term manager and friend, David Whitehouse, they went ahead with its release. It is the only British number one single to feature a mother and son. Originally released in early 1972, it flopped on its first release. It was picked up in Belgium and used on a current affairs programme, and became a hit there, reaching number one in the Belgian singles chart. Decca, encouraged by this success, re-released it and with the backing of then BBC Radio 1DJNoel Edmonds, it finally became a hit in the UK, spending four weeks at the top of the UK Singles Chart in October 1972. It sold 790,000 copies. In New Zealand, the song was number one for five weeks. The song also reached number one in Ireland and reached the Top 10 in Canada and Australia, but did not chart in the United States. "Mouldy Old Dough" became the second biggest selling UK single of the year, behind The Band of the Royal Scots Dragoon Guards' bagpipe version of "Amazing Grace". It is strikingly similar to the Bill Black's Combo instrumental White Silver Sands from the early 1960s. The tune was also used by LOTO New Zealand as a successful advertising routine. As of April 2019, Hilda Woodward's piano is an Exhibit at Coventry Music Museum, where other artefacts belonging to the band are also on display.
The song has been covered by British group Shades of Green and features in their first album Rockin' Poppin' Ravin', released in 1973 by Windmill Records, London.
The song is widely regarded as the 'theme song' for the sport of Banger racing, where it is played at the start of races during the 'rolling lap'.