Hello Mike.
I have hand-looked the 1841 census for Banstead and I'm unable to locate this family.The 1841 census is notoriously difficult to read,in some parts impossible.
However I did look at the Banstead Parish Register transcripts as published by West Surrey Family History Society.
Baptisms.
Oct7,1821.EELES,Ann Louisa,dau,Stephen and Martha,servant.
June2,1823.EELES,William,son,Stephen and Martha,servant.
Oct17,1824.EELES,Henry,son,Stephen and Martha,servant.
Dec3,1826.EALES,Charlotte,dau,Stephen and Martha Ann,servant.
Jun13,1828.EELES,Stephen,son,Stephen and Martha Ann of Banstead Heath,footman to Lord Arden.
Jun21,1830.EELES,George,son,Stephen and Martha Ann of anstead Heath,footman to Lord Arden.
I can find no record of a marriage on the Surrey Marriage Index,also pub.by WSFHS.
But there is a record of a possible marriage listed on the IGI.
Mar15,1818.St.Marylebone,London.Stephen EELES to Martha Ann WELCH.
Hope this helps.
Regards,
Dave.