When I applied (well, had a meeting pre formal application) to Cambridge I didn't have a foreign language, which (back then) was a formal Cambridge university requirement. I was told "it makes life simpler if you have it, but if you don't, we can get an exemption". (In the end I did a quick Russian course and scraped a C).
So my guess is that if they want you, there's a pretty good chance they'll make an exception.