Hi again,
Assuming this IS the correct family (Slowhands is a far better sleuth than I am, I just search the PRs on this site's database), then if we use the very useful "advanced search" facility at bottom of the PR Search page we can find these Baptisms for our couple:
http://www.forum.forest-of-dean.net/index.php?mode=page&id=2

Record ID Year Parents Surname Child Forenames Fathers Forenames Mothers Forenames Mothers Surname Residence Occupation Parish Chapel

376289 1811 TYLER John, William & Sarah, Ledbury
292804 1814 TYLER Sarah, William & Sarah, Parkway, Labourer Ledbury
293031 1816 TYLER Elizabeth, William & Sarah, Parkway, Carpenter Ledbury
293254 1818 TYLER Hannah, William & Sarah, Parkway, Labourer Ledbury
293697 1822 TYLER Joseph, William & Sarah, Parkway, Labourer Ledbury
293981 1824 TYLER Esther, William & Sarah, Parkway, Carpenter Ledbury

Which suggests any marriage would be around 1810 or earlier ?

Now again use "advanced search" but for Marriages,
http://www.forum.forest-of-dean.net/index.php?mode=page&id=22

Search for ALL Marriages between "William T" and "Sara", so finding all with a "T" in the surname to allow for spelling variations. Of the 400+ results can re-sort them chronologically by clicking the column header, and then browse thro quickly to find what seems the most obvious hit, namely:

Record ID 66723
Entry Number 118
Year 1806
Month Oct
Day 27
Grooms Surname TILER
Grooms Forenames William
Grooms Age
Groom Condition Bachelor
Grooms Occupation
Grooms Residence of this parish
Grooms Fathers Surname
Grooms Fathers Forenames
Grooms Fathers Occupation
Brides Surname FLUCK
Brides Forenames Sarah
Brides Age
Brides Condition Spinster
Brides Occupation
Brides Residence of this parish
Brides Fathers Surname
Brides Fathers Forenames
Brides Fathers Occupation
Licence or Banns Banns
Date of Banns
Signature or Mark He signs she marks
Witness 1 Edward Greenus
Witness 2 Elizabeth Greenus
Other Witnesses
Officiating Minister Charles Whatley rector
Event Marriage
Memoranda
Notes No dates of Banns
Register Reference AR90/5
Page Number 29
Parish Chapel Aston Ingham

In case you don't know the area Aston Ingham is only a few miles from Newent, a little further north to Ledbury.
http://www.genuki.org.uk/big/eng/HEF/AstonIngham/Gaz1868.html

ASSUMING ??? the groom is from Aston Ingham, and not from one of several adjoining parishes (it's a common name locally), this SEEMS like a possible hit:

Record_ID: 277178
Entry_Number: 458
Year: 1781
Month: Mar
Day: 7
Parents_Surname: TYLER
Child_Forenames: William
Fathers_Forenames: Joseph
Mothers_Forenames: Mary
Mothers_Surname:
Residence:
Occupation:
Officiating_Minister: W L Baker Rector
Event: Baptism
Memoranda: Son of born Feb 11
Notes: Any abbreviated forenames have been expanded to the full name
Register_Reference: AR90/2
Page_Number: 30
Parish_Chapel: Aston Ingham
Soundex: T460

Searching the less common bride's name in the Database gives this probable Baptism:

Record_ID: 277225
Entry_Number: 505
Year: 1785
Month: Jul
Day: 24
Parents_Surname: FLUCK
Child_Forenames: Sarah
Fathers_Forenames: James
Mothers_Forenames: Mary
Mothers_Surname:
Residence:
Occupation:
Officiating_Minister: W Lloyd Baker Rector
Event: Baptism
Memoranda: Daughter of
Notes:
Register_Reference: AR90/2
Page_Number: 32
Parish_Chapel: Aston Ingham
Soundex: F420

So she was abt 21 when marrying, a good fit.

I'm off now, don't know where in the world you are but its 1.30am in the UK, time for a beer and catchup on the cricket "high"lights... Suggest you keep plugging away searching the database, it's very easy once you get the hang of it. Any problems we'll try and help tommorrow.

Goodnight & happy hunting, Jeff