Have you tried Non-Conformist records? .....
There are West Yorks Non Conformist records on Ancestry -- as well as general non-conformist records on Family Search. Might be worth a try.
Hi Pennines,
I've searched all the West Yorks records on Ancestry, which includes the non-conformist records that they have indexed. I don't know how complete their indexing is, so there could be some records that wouldn't show up in a search, but I haven't yet looked at records that are not indexed on Ancestry. Same applies to FAmilysearch. As both daughters were married in the establised church, I've been looking in those parish records, but non-conformist records are certainly a possibility and I'll look at them more closely.
Ancestry recently released a new set of records for West Yorkshire, Select Land Tax Records 1704-1932 and I've found several records for George Hemingway in Dewsbury in the period 1796-1832, although it appears that these refer to at least two individuals. In 1805-1807 one location refers to "late Geo. Hemingway" while the other continues as Geo. Hemingway. There appeared to be two locations where a George Hemingway was an occupant, one is in premises owned by Richard Crawshay then later John Dickenson, and a second in premises owned by John Wilson & Co. then later Wilson, Greenwood, Auty & Hemingway and then Wilson, Hemingway & Co.. So it confirms that at least one George Hemingway was in Dewsbury in the period of interest, however I'm puzzled why he doesn't appear in either Baine's Directory or Pigot's Directory?