Of course, it may have been ttanscribed as "Elliot/t" with ANC and I'm not familiar enough with Ancestry to advise how to search under Census reference.
But can you search Anc by location only plus place of birth?. I searched FindMyPast by entering location as"Liskeard" and Place of birth as "Barking" - nothing else. There are not many living in Liskeard in 1861 and born in Barking. But Ed's mother Mary is!
Alternatively, search for Thomas (no last name), born 1808 (exact year), place of birth Liskeard, occupation cooper.
Else a better qualified Rootschatter is certain to answer your call about searching under reference.
Added - problem solved!!