:)Dear Skylark
I know I am connected somehow to the Old Swinford and Kingswinford Dancers, however, where your William Dancer born 1786 to Richard and Sarah falls down as my William Dancer born 1790 I believe in West Smethwick , is the marriage, my William definitely married Mary Ann Walker on Sept 27th 1811 at St Martins in the Fields, Birmingham, and definitely died in Lower Bradley in September 1826 and was buried in St Leonards Churchyard, Bilston.(now a Car Park!).Did your William marry twice?
I am going to search the records for his Parish, known as Smethwick Old Church or Park's chapel, hopefully I will find his baptism unless he never was baptised, which might be the case if he was illegitimate. Good Luck building your tree!