I am looking for Thomas Hoptons parents William and Ann. Thomas was christened on 05/08/1783 in Slimbridge.

Hi

How about this one?

William Hopton, w. & Ann Martin 7 Mar. 1773

http://www.glosgen.co.uk/slimbridge1745.htm

Found a possible for Ann on IGI:

ANN MARTIN Pedigree
Female

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Event(s):
Birth:
Christening: 08 NOV 1751 Slimbridge, Gloucester, England

Death:
Burial:

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Parents:
Father: GEORGE MARTIN Family

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Messages:
Extracted birth or christening record for the locality listed in the record. The source records are usually arranged chronologically by the birth or christening date.

There is at least one possible sibling where the mother's name is given as Sarah.

Hi ChrisW,
Thanks very much for the information.