Hey There.
I think in the next few months until uni applications start being completed, you should really research all training routes and which is really best for you.
I cannot give any opinion on Brunel as I have knowledge of it as it is a really new course. I did however apply for the Bucks course and am in the final year of the Kingston course.
I do not want to get into wether it make you more marketable, it is one of those debates that is down to personal opinions and the debate could go on forever.
The Kingston and Bucks courses both get you an Honours degree all be it in different subjects both relating back to aviation studies.
Both courses also include your PPL training, ATPL groundschool, ME/CPL/IR and in theory, you are ready to get a job on completing your 3 year degree (but obviously there needs to be jobs available

) Both have different strucures but you acheive basically the same thing at the end.
You say you want to be in London? Brunel would be your nearest, Bucks you will be in High Wycombe most of the course but will spend 6 months in either Cranfield or Bournemouth, and Kingston, you will spend the first 2 years in Bournemouth and the 3rd year in Kingston. I am not sure on the Brunel, but on the other two, there is the option to spend time abroad during the course doing your training.
The other misconception about these courses is that you pay your tuition fees and that covers all flying hours. This isn't true! Tuition fees cover your Degree course and the PPL & ATPL groundschool. All flying comes at an extra cost.
If you want to know anything else about the courses, just message me.
C89