At the risk of sounding pedantic:
A christian name is spelt: "Cattell" on the "old" GRO birth index.
On the digitised "new" index it is spelt "Cattill".
(Reference: Sep qtr 1875 for Thomas Catte(i)ll Bromwich CLAYTON)
This difference is no big deal in the scheme of things,but may have implications for the research of surnames. I am not likely to buy the certificate which may show the recorded spelling. How accurate are both indexes anyway? Gazania
If you base you research on such precise spelling of names I am afraid you will not get very far at all.
The GRO Registers are all based on transcripts which are open to spelling mistakes, the further back you go the more fluid spelling becomes.
As for the indexes, the new index of Births and burials should be reasonable accurate as it is claimed to be taken from the registers but as yet there has been no assessment on how accurate it is.
The old index was very variable as it was a compilation of a variety of sources all of which were transcripts. The old index started as a handwritten index then was typed and eventually was digitised and contained many errors and omissions and even in 1914 was seen as not fit for purpose by a Royal Commission on Public Records.
Master Arthur Francis Ridsdale, who served in the Chancery Division of the High Court from 1912 until his death in 1935 stated in evidence to the Royal Commission in 1914 that prior to the year 1898 or thereabouts, it was usual to permit searchers, who were chiefly solicitors engaged in pedigree cases in Chancery, or professional record agents, to inspect the original registers, then at Somerset House.
Master Ridsdale showed there was a need for inspection of the registers themselves, using examples of the inadequacies of the indexes.
This state of affairs continued to the present day even though access to the GRO Registers was stopped, I suggest you read the two books published a number years ago (the second book was published in 2002) by Mike Foster "The Birth, Marriage and Death Records of England & Wales - A Comedy of Errors" and "The Birth, Marriage and Death Records of England & Wales - A Comedy of Errors, Act 2" which detail a number of errors and omissions.
Cheers
Guy