As you perfectly well know being UK (unless you live in a backwater) London University is a secular university which requires the highest level of scholarship. .
They may require scholarship, they cannot prevent such as you superimposing your opinions on what is simply not there.That is the problem valiant. You have no regard for history or the meaning of scripture, you twist it all to your apriori beliefs so all that study was wasted on you.
We DO know what language was spoken, because for the common man such as Peter aramaic was the working language.
And if history is not enough for you, scripture says it clearly in acts 1-19 "the people of jerusalem called in in their language akeldama, fields of blood" which is ARAMAIC
And the ONLY reason you contest it is you do not like the obvious meaning.
Petra and petros are the same. Peter is the rock of the church.
Even the phrase "thou art peter, and upon this rock" is a protestant way of writing what is there.
It should read
either Simon....thou art (I will call you) peter and upon this (large) peter I build my church.
or Simon.... thou art (I will call you) rock and upon this (large) rock I will build my church
Same word. So either peter or rock should be used.
Your translation makes no historic sense - it was aramaic,
but neither does it make grammatical or idiomatic sense
Because if Jesus were trying to distinguish ordinary idiom would say "but" or "other"
Peter thou are a rock, but on this other rock... He did not say it, because that is not what he meant or said.
NOTHING IN YOUR VERSION MAKES SENSE OTHER THAN YOUR DETERMINATION TO IGNORE THE OBVIOUS.
I could ask 100 kids and they would say it was Peter. "revealed to children, hidden from wise men" spring to mind, except everything you say does not point at wisdom.
Then take sola scriptura. " all truth is in the bible " or "all necessary truth is in the bible" (protestants cannot even agree on it)_
But you make the classic logical error of assuming A AND B is the same as NOT A and NOT B ie that which is not in the bible is not necessary for salvation.
Nor is your view logically possible. Because "IF all necessary truth were in the bible" that very statement IS in your view a necessary truth so has to be in the bible to be logically possible. It is not. So logically false.
Jesus never said it either. Because the scripture on which you rely was not written then.
Sola scriptura is logicall, biblically and historically false.
It leads to all sorts of stupidity. For example Paul said "hold true to tradition passed on by word of mouth and letter" - why ? because the gospels were not in circulation yet. But taking sola scriptura "your way" - I can use it to say that the gospels are not to be used, because only word of mouth and letter?
Sola scriptura is provably silly. Not historical. Not biblical. Not logical
So Valiant study logic and history , this time without twisting what it says, so the obvious translation of "peter the rock" prevails. So learn something before you comment again.