Mark
Very little Littleworth actvity in Fittleworth (none I could see in Petworth) just the marriage, baptism of William and burial of William and Mary. I didn't see a burial for Sarah in the 1820's. Do you know roughly when James would have remarried for the 3rd time?
In case you don't have full details
3 May 1819
James Littleworth of Fittleworth and Sarah Sadler of Fittleworth witnesses Solomon Wells and Esther Hawkins all above made their mark plus Geo Piper clerk
I've just realised I didn't notice what if anything it said for James' condition at marriage - will check that for you at some point
Baptism Jan 2nd 1820 William son of James and Sarah Littleworth abode Fittleworth occupation Labourer
Burial Feb 16th 1820 William son of James and Sarah Littleworth 2m
Burial Oct 31 1825 Mary Ann daughter of James and Sarah Littleworth 4yrs
All at Fittleworth
Egdean Baptisms
16 Sep 1798 Sarah dau of James and Jane Sadler
April 10 1811 Jane base born dau of Sarah Sadler
Egdean Burial
Aug 11 1811 Jane Base born dau of Sarah Sadler - poor Sarah all 3 of her known children died

Jan
