Low-cost exam centres within GL / London

[plaguedbyfoibles]

One of my long term goals is to attain a high grade in A-level maths by sitting the exams as a private candidate.

I do not require a tutor as I have been content to self teach whenever I have found the time.

Does anyone know of any schools, colleges or private exam centres near or within GL - Northwest London / West London / North London - that can accommodate private candidates without necessarily charging over the odds?

I do not have a deadline for this goal, so it would be great to compile a list of places at which I could make an enquiry.

Last time I checked, it seemed that the typical cost of sitting the A-level exams as a private candidate was ~£200.

And if you believe this to be an expensive pipe dream, do let me know.

Some of the resources I have found thus far:

https://cloudlearn.co.uk/ExamCentres
https://he-exams.wikia.org/wiki/Finding_an_exam_centre
https://www.learnnow.org.uk/find-an-ede ... ourse.html

Of course, certain venues that once accommodated private candidates no longer do so, so it would be to great to ring up some places and see which ones still do.

Thanks in advance.