Christopher, I live in St Gregory's parish, Weld Bank and my mother's name is Culshaw. The following should be of some help.
1. From Weld Bank marriage register: 23 Oct 1880 Daniel Farnworth of Moor Road, son of John Farnworth, married Mary Culshaw, daughter of Henry Culshaw of Coppull. Witnesses: William Culshaw of Skelmersdale; Mary Helen Culshaw of Skelmersdale. Priest: John (Dean) Lennon.
2. From 1881 census. 19 Ormskirk Rd, Skelmersdale, Lancashire. Elizabeth CulshawHead Widow 73 F Wrightington, Lancs Ellen Culshaw Daur. Dressmaker Un 36 F Wrightington, Lancs William Culshaw Son Coal Miner Un 28 M Coppull, Lancs James Culshaw Gson Scholar 8 M Coppull, Lancs.
3. From 1871 census Coppull Near Oak Tree Henry Culshaw Head M 64 Tailor Wrightington Elizabeth Culshaw Wife M 62 Wrightington Ellen Culshaw Daur U 27 Dress Maker Wrightington Elizabeth Culshaw Daur U24 Servant Wrightington William H Culshaw Son U 18 Collier Coppull Mary Culshaw Daur U 15 Servant Coppull William Shaw Boarder U 49 Tailor Isle of Man
I don't have the details of this family in my notes for the earlier censuses. Probably for the 1861 and 1851 censuses they were in Coppull and for 1841 in Wrightington as indicated by place of birth of the children, so they shouldn't be too difficult to find as these are quite small places.
4. From Weld Bank baptism register (siblings of Alice Ethel) 27 Feb 1881 - Veronica Farnworth born to Daniel & Mary (nee Culshaw) Sponsors: Richard Wilson, Ann Baxendale 13 Mar 1883 - Ann Helen Farnworth born to Daniel & Mary (nee Culshaw) Sponsors: John Tierney & Helen Barrow (note added later: 'Ann Helen married George Francis Ainscow at St Mary's Chorley, 24th May 1915.) 15 Jun 1885 - Elizabeth Farnworth born to Daniel & Mary (nee Culshaw). Sponsors: James Culshaw & Elizabeth Sharratt 2 Apr 1887 - Alice Ethel Farnworth born to Daniel & Mary (nee Culshaw). Sponsors: Joseph Sharratt & Mary Jane Greaves. 2 Jun 1889 - Philip Fielden Farnworth born to Daniel & Mary (nee Culshaw) Sponsors: William & Jane Hale. Note: 'Philip F Farnworth married Elizabeth Farrimond at St Mary's Church Chorley on 17 Feb 1909'. 30 Dec 1890 - Daniel Farnworth born to SAMUEL & Mary (nee Culshaw) Sponsors: Thomas Cornwell & Charlotte Baxendale. (Name 'Samuel' could be a transcription error) 22 Feb 1895 - James Farnworth born to Daniel & Mary (nee Culshaw). Sponsors: Montague Thomas Baxendale & Elizabeth Stringfellow
That's about all I've got. Best wishes. Pauline Critchley.