First of all, many thanks to all who responded to my initial request. Sorry for the delay in responding, but I've been working away from home.
Now to summarise all the evidence presented by my learned colleagues, in chronological order:
1823 Ann Walker attends school in Belper.
1841 Ann Walker (15) recorded, living with her parents Isaac Walker(50), Nail maker and Hannah Walker(40), cotton spinner.
1841 James Attenborough(15) living with his family at Heage.
1843 Ann Walker marries Matthew Hunt on 19 Feb 1843 at Crich.
1845 Matthew (Hunt)Walker dies Q2 at Belper
1847 James Attenborough marries Mary Ann Hunt Q4 at Derby.
1851 Ann Hunt(28), widow, Employed in cotton spinning factory, recorded at 21 Birkin Court, Belper living with her father Isaac Walker(60), widower, retired nail maker.
1851 James Attenborough(28), married, brickmaker recorded at Market Place, Belper living with his in-laws.
1851 Mary Ann (Alton?) Attenborough(25) recorded at South Winfield with her daughter Mary Ann Hunt Attenborough(7mths)
1853 Hannah Attenborough born at Oakerthorpe.
1855 Mary Ann Attenborough(nee Hunt) dies at Belper.
1857 Ann Hunt(nee Walker) marries James Attenborough Q2 at Derby
1859 Isaac Attenborough born at Short Rows, Belper to James and Ann Attenborough(nee Walker)
1861 JAMES (H)Attenborough(40, Collier recorded at Short Row, Belper with his wife Ann(38), Mill hand, daughter Hannah(8 ), daughter Ann(3) and son Isaac (1) living next door to Ann’s father Isaac Walker(60), widower, Nail maker.
I hope I got it all right, but if I didn't please let me know.
Thanks again for all the information.
Regards,
Ian