It’s a dual-purpose document, combining a conveyance with letters-of-attorney. Dated 1470, not 1480, and referring to a prior conveyance of 1456.
Vance has done the first 6 lines. Here is my attempt at translating the rest:
… to the south. This capital messuage with buildings, shops and gardens, with appurtenances, we held jointly with William Spalding, dyer, lately citizen of Norwich, and Richard Cromer and William Oldebarby, lately citizens and aldermen of Norwich, and Henry Bovy, clerk, now deceased, from a conveyance and feoffment of John Child, lately of Norwich, chaplain, as is more clearly contained in a certain charter dated at Norwich on 3rd day of January in the 34th year of the reign of King Henry VI [1456], then drawn up by us. To have and to hold all the aforesaid
[extract 2]
messuage with buildings, shops and gardens, with appurtenances, to the aforesaid William Skarlet, Philip Curson, William Blythe and Robert Pype, their heirs and assigns for ever, from the chief lords of that fee, for services thence due and by right accustomed. And furthermore everyone present should know that we the aforesaid Thomas Elyes and John Heydon have appointed, ordained and put in our place our beloved in Christ Thomas Drantale[?], clerk, Thomas Lynne, weaver, and William Roo[?] the elder, jointly and severally, as our faithful attorneys, to enter into the aforesaid messuage and to give full and peaceful possession thenceforth to the aforesaid William Scarlet, Philip, William Blythe and Robert Pype in our place and in our name, according to the tenor and effect of this charter. It is ratified and consented that whatever these our attorneys or any of them shall do in our names regarding these premises [shall be lawful]. In witness of which matter we have fixed our seals to these presents. These being witnesses: Thomas Bokenham, William Lyster, notary, John Burgh, John Swan, Ralph Bygot and others. Given at Norwich on the sixteenth day of August in the year of the Lord 1470 and in the tenth year of the reign of King Edward IV after the Conquest of England.
ADDED
Not sure about some of the names - others may have suggestions?
Lines 5-6 maybe Agatha Banyngham?