I've just come back to this thread and want to start by stating that I don't buy the notion that an MFL degree is somehow a lesser beast than other humanitues degrees. As a fluent speaker of Italian, with neglected but good French, a smattering of German and Russian, as a lover of Latin and as a former teacher of English as a Foreign Language, and with a DD in her final year of French at Oxford, I'm going to throw in a few random, unrelated thoughts about language learning in the UK.
It's a shame that the teaching of Latin in state schools is dying on its feet. Learning a language is supported hugely by properly understanding grammatical structures, verb conjugation, gender, and the sequence of tenses. Without the framework these provide for making sense of what you are being taught, students in the early stages of language learning are reduced to learning lists of words in a vain attempt to encourage them to communicate something meaningful.
State schools teach languages in a functional way, aiming to make it fun for students, and with an eye on GCSE results, the E-Bacc (may its soul rest in peace) and Progress 8. Within those straitened confines, there is little room for the rigour and breadth that characterised language teaching in the 1970s and 1980s. DD did her GCSEs at a high achieving comprehensive then went to an independent sixth form on a music scholarship. She realised within the first week that her classmates in French who had been at the school throughout had been much better taught than she had and that she had a lot of catching up to do. At home, when she was in Y10 and Y11, she and I had done a fair amount of work on tenses, auxiliary verbs, conjugations, the gerund, past participles and conditional clauses, none of which had even been introduced at school. Without that, she would have been even further behind once she started A level. In sixth form, once the medics who thought A level French might be an easy fourth A level had dropped out (because it wasn't easy), there remained only one other pupil in the class besides her. So with languages as with classics, music and sport, pupils with parents who can afford to pay get a head start.
As well as wrecker Blair, we also have wrecker Gove, whose reforms squeezed creative subjects to the margins of the secondary curriculum. Music, by training the ear, can, like Latin, be a foundation discipline for languages, particularly the spoken language.
DDs close friendship group at university are materials scientists. In their first year, they teased her as a modern linguist, saying hers was an easy degree. Now that they've seen the texts she is reading, gained some insight into the concepts she has to discuss in tutorials twice a week, tried to understand something about linguistics, and followed some of her more challenging adventures in France, they have changed their minds. They acknowledge that while DD is not able to understand and do what they do, they do not have the aptitude to understand and do what she does.