I'm talking about historical use of these letters in Latin.
But if you've seen middle and early modern English text that hasn't been sanitized for modern readers, you will see a lot of stuff. You'll see W written as uu. You'll see lots of Vs and Us trading places, in places we no longer put them.
And eg. I kind of suspect the UK pronunciation of lieutenant, where u is /f/, has roots in it being /v/.
It says that in French of the time as heard by English people at the time, the phonetic value of that u was ambiguously heard as f or v.
My position is v and u were phonetically ambiguous or sometimes heard as the same in Latin and romance languages. Maybe also in older forms of English.
But if you've seen middle and early modern English text that hasn't been sanitized for modern readers, you will see a lot of stuff. You'll see W written as uu. You'll see lots of Vs and Us trading places, in places we no longer put them.
And eg. I kind of suspect the UK pronunciation of lieutenant, where u is /f/, has roots in it being /v/.