There are a number of threads here already that discuss various branches of the PHELPS family at Glasshouse Hill - have you found / digested these ?

such as
http://www.forum.forest-of-dean.net/index.php?id=20972
and
http://www.forum.forest-of-dean.net/index.php?id=33736

Year: 1817
Month: May
Day: 10
Grooms_Surname: PHELPS
Grooms_Forenames: John
Grooms_Age:
Groom_Condition: Batchelor
Grooms_Occupation:
Grooms_Residence: Newent
Grooms_Fathers_Surname:
Grooms_Fathers_Forenames:
Grooms_Fathers_Occupation:
Brides_Surname: HARPER
Brides_Forenames: Sarah
Brides_Age:
Brides_Condition: Spinster
Brides_Occupation:
Brides_Residence: Newent
Brides_Fathers_Surname:
Brides_Fathers_Forenames:
Brides_Fathers_Occupation:
Licence_or_Banns: Banns
Date_of_Banns:
Signature_or_Mark: Both mark
Witness_1: William Narrer[?]
Witness_2: John Bowkett
Other_Witnesses:
Officiating_Minister: Richard Francis Onslow Vicar
Event: Marriage
Memoranda: with consent of Parents
Notes:
Register_Reference: P225 IN 1/10
Page_Number: 18
Parish_Chapel: Newent

Year: 1799
Month: Mar
Day: 10
Parents_Surname: HARPER
Child_Forenames: Sarah
Fathers_Forenames: William
Mothers_Forenames: Hannah
Mothers_Surname:
Residence:
Occupation:
Officiating_Minister: J Foley Vicar
Event: Baptism
Memoranda:
Notes:
Register_Reference: P225 IN1/3
Page_Number: 49
Parish_Chapel: Newent

and perhaps :?

Year: 1793
Month: Nov
Day: 3
Parents_Surname: PHELPS
Child_Forenames: John
Fathers_Forenames: William
Mothers_Forenames: Susanna
Mothers_Surname:
Residence:
Occupation:
Officiating_Minister:
Event: Baptism
Memoranda:
Notes:
Register_Reference: P206 IN 1/3
Page_Number: 117
Parish_Chapel: Longhope