Maybe worth mentioning that in the six years it took her to get a BA(Hons) with the OU Mrs S#2 also managed to have two children. Yes it cost me money but I saw and still see it as in investment. Actually the fees haven't gone up that much judging from Wenchy's quoted costs and, of course, wages have risen in the time since I was paying the fees.
She has just gained a PGCE as a part time student taken over the past two years whilst looking after me (in that time I have spent several weeks in hospital and had a heart attack), three children and working as a part time tutor (to gain the necessary teaching hours) teaching adults basic skills via the medium of "Arts and Crafts" in the community. The PGCE was paid for by a government grant which is available to fund all prospective teachers.
She did well enough on the PGCE course for the Uni to approach her with a proposal that has enabled her to progress to do an MA which her university will pay for in exchange for her doing some p/t lecture work and student mentoring for them on the next PGCE courses they run.
If you want to do it there is no such thing as "Cannot afford". It is always possible to find a way.