Have you ruled out this one:
Edmond Vimpenny
26 August 1782
EASTINGTON AND ALKERTON, GLOUCESTER, ENGLAND
father:
Edmond Vimpenny
mother:
Rebeckah
Probable marriage:
26/12/1781 Fretherne Glos.(abt. 5mls. from Arlingham)
Edmund Vimpany=Rebecca Vail.
There's another birth to an Edmund & Rebecca:
Edwin 1801 Saul, Glos. (abt. 2mls. from Fretherne)