Joseph Cockin of Halifax, has a Registered Will at York, likely to be at the Borthwick Institute (located within the University of York).
Proved, November 1828, Volume 177, folio 301, Cockin Joseph of Halifax, T. 800 [Testamentary, up to £800]
https://www.york.ac.uk/borthwick/Estate DutyAlso Joseph Cockin of Halifax appears in the 1828 Index (Indexes on f m p) to the Board of the Inland Revenue Estate Duty Registers held at TNA, Kew, England and the index also confirms the Court was York.
(Sliding the images over, the Register column appears to say Register 4, a Folio reference and Succ'. Ledger V)
Ely Bates was either Sole Executor or one of the Executors / Administrators dealing with the Will.
If no listing appears online, but are listed in the Index, then these Estate Duty Abstracts have to be manually searched for at TNA, Kew. They start from 1796.
https://discovery.nationalarchives.gov.uk/details/r/C9364Some contain only a Summary of the Will. However, where a Will was not settled e.g. using Trustees to administer the Will (some Wills took years to settle with the Will Beneficiaries having died themselves), then some of these Abstracts might contain further names about later beneficiaries.
I am finding a few of those available online have added notes on, or in the corresponding place on the next page, including names of later family or relatives, who must have become liable to pay the Estate Duty.
Mark