"Facilitating" subjects, essentially do exist. They are now called "A levels that keep options open". Cambridge university helpfully list them. However, when you know what you want to do, they have little relevance if the course does not require one or more of them. It is that simple. Drama is good for Drama. Photography is good for Photography. Music is essential for Music. None are facilitating! English Lit goes perfectly with Drama. So there simply is no problem. I think the bigger poroblem is plotting a career path! The degree is a vehicle, not a guarantee of a job.
English Lit is on the Cambridge list. There are loads of subjects the DD involved could do with her choices. However they won't stretch as far as they might have done if she had made alternative A level choices. But it doesn't matter, does it? And apologies to OP for misinterpreting her DH's job.
It is not correct to say to ALL young people that subjects do not matter. At very competitive universities (and not all RG are by any means) they will take not all sorts of A levels on every course. It is as simple as that. On lots of courses at RG universities they will. Eg sociology, law, philosophy, film and photography, international relations, American studies, marketing, education, journalism, communication and media (and plenty more), are all possible with non-facilitating A levels. Any course where none in particular are specified you have a decent shot without facilitating subjects, but not if it is wildly competitive, in many instances, and the university considers some subjecs are better prep than others. It really depends what DC want to do and what the course info suggests is a useful subject.
It is not correct to say the old list of facilitating subjects is useless. It is not. However, for lots of DC, one of these subjects will do. For other DC they simply don't need any of them for RG courses. Always check first. If you do not have any idea about university, course or career, include at least one!