Lucky you Jamie, the marriage was by licence & the details are from the Sussex Marriage Index. First licence details;
Archdeaconry of Chichester Marriage Licence, 20 Jan 1802:
Rebecca READ, Bosham sev yrs sp 19 wcof George R of Bosham lab
John DOLLOWAY, Woolbeding 4 wks cordwainer bach 21
Sponsors ss; JD James BARTON of St.Olave Chich taylor
Then the marriage next day. wcof=with consent of father, which is George Reed

& you also know her dob was about 1783.
Bosham, West Sussex, 21 Jan 1802:
Rebecca REED, otp
John DOLLOWAY, Woolbeding
The IGI gives an extracted baptism for Rebecca Read. 12/9/1784, Bosham d/o George Read & Mary Finch.
The Reed/Finch marriage did occur,
Bosham, West Sussex, 21 Jun 1781:
George READ, bach N Mundham (REED in banns)
Mary FINCH, sp otp
Witness wits: Thos BALAM Anne READ
Hope that helps,
jane