Trust me it is helpful! When you know very very little because one lady wont ever, has never spoken about a few people, and people now 60yrs on know their Dad because of kind help on here, it helps! 
Nope. I only knew that she was my Mums Aunt when she told me about 3 weeks ago, it wasnt an avenue that i had traveled yet. Would it be worth getting hold of a copy of her birth cert then?
What I mean is: what is really helpful is you telling us what you know already! -- especially when it is about an earlier child of the same mother as your Sarah's.
Yes, I would get both birth certificates:
Nellie Lawe 1911
Helen Lawe 1916
We know that Helen 1916 was Nellie's child, and it seems highly likely that Nellie 1911 was too.
So it would be worth knowing what information was reported re their father(s).
Their marriage certificates would also be interesting, as long as we're spending other people's money.
... Actually I don't think there is a marriage for the 1911 Nellie; the 1927 and 1930 marriages don't have middle names, although they are still possible.
A Nellie Lawe married Hazelwood in Horncastle in 1927. Can't really identify a death or remarriage for her.
A Nellie Lawe married Nash in Birmingham in 1930. Name is way too common to identify a death.
Those are the only two Nellie Lawe marriages in the index.
There appear to be no births to either marriage.
- edit - I was spelling Hazlewood wrong - but no more luck identifying a death for her or husband or any births
But apart from the two Nellie S Lawe births, there is only one Nellie Lawe birth: 1895 Pontefract.
Of course, the Nellie(s) who married could have been Lawe by marriage, but there is no Nellie + Lawe marriage either.
Getting the exact date of birth for Nellie 1911 could find a death for her, if she died after 1969. I might wonder whether she was given up at birth and renamed ...
The 1921 census can't come soon enough for some of us!
I think MargP just mistyped "baptist" for "baptism"
So there is no father named on the baptism record ...
