I can't really give you much specific advice on the English department, but do you know about the major-minor system Lancaster has? While it doesn't work for all subjects, if you're taking English Language you'll be expected to take two subjects alongside that in your first year. So, if you apply for either one of those courses you can take English Language, Media AND creative writing, as long as the lectures don't clash. You drop back down to one or two in your second year, but you can change from your original choice if you like and the department agrees.
I'll be honest, I've heard mixed reviews of creative writing. Apparently it's pretty disorganised in first year, but you have small seminar groups where you review each other's work and it's all coursework based so you have one fewer exam at the end of the year! The other subjects I don't really know about, but I know Linguistics is really good so hopefully English Language should be too!