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Another correction: Frederick and Mary Ann were of course not the parents of Henry but brother and sister-in-law.
Alan

Brilliant! Yes, That will be 'our' William BATCHELOR; he was living in Stephens (with a final 's') Street, St Marylebone,  in the 1841 census.
Alan

Brilliant, Kay
Frederick was also a shoemaker/cordwainer and two of his children were named Frederick William and Elizabeth so it is very likely that you have identified his parents/family.
I guess BTs would be the only other way of possibly finding his baptism (if they exist).
If you ever need some New Zealand research done, let me to your posting via this thread.
Gratefully
Alan

That's very kind of you, Kay
 The only helpful census is 1861 (at East Row, Kensal Green, London): “Frederick, 55 yrs, [occupation not legible] , born Worcestershire, Chinaslip   [which must surely be a transcription error for HINDLIP?], his wife Mary Ann  60yrs, laundress, born Middlesex;  Ellen  15 yrs, ironor,  and Walter 10 yrs, scholar, both latter born Chelsea, Kensal Town”. The marriage was in London.
 At his death in 1877 his age was given as 68 years. So his birth may be between 1805 and 1809.
I know nothing of his siblings or parents.
PS. I live on the other side of the world from Worcester, but I have just found two web references to baptisms in the early 1800s  at "St Albans (China Slip) Worcester" so perhaps my 'Hindlip' supposition is wrong. China Slip/Chinaslip is not in standard gazetteers.
Alan