I kept one floppy from my Commodore 128 (which I used mostly in C64 mode), which is written Oxford C compiler. It is a 5.25" floppy. Don't ask me why I kept just this one; probably because I thought I wanted not to keep a game but something 'serious'. I think it even doesn't work anymore (nor I can play it back since I don't own a Commodore anymore).
However, I cannot remember I ever used C, and most of all, I cannot find any references of an Oxford C compiler. The only reference I find is an Oxford Pascal compiler (like here).
Was there ever an Oxford C compiler, or was it for a different computer somehow, or maybe I labeled it wrongly (and it should be Oxford Pascal); note the label is handwritten, so it's not an official disk.
I'm just a bit curious.