As other posters have said, the number and type of part time courses available with respect to adult learning have reduced significantly, and in some cases, almost disappeared. The main factor driving this trend is funding. In April, for example, a further 6% was cut from the Adult Skills Fund. Indeed, since 2010 over £1 billion has been cut with respect to opportunities for adults to re-train and build skills in this sector:
Adult skills funding cuts will undermine… | Association of Colleges
Another factor is that local authorities have immensely squeezed budgets, and funding is often available only for courses that offer skills for employability (often funded partly by the DWP), re-settlement programmes and so on.
Access to HE courses are still run, and for some adults, these may be a viable alternative to A levels if the individual wishes to study a university level course. However, you may find more of these courses online than in a local FE college.
Online learning has also impacted on the number of face to face part time offers available at colleges and other centres for education, many online providers offer short modular, skills-based courses.
There seems to be a decline in learning MFL at a higher level. In the university for which I work, there have been significant redundancies in this area:
New report shows a catastrophic decline in formal language learning - HEPI
FE colleges have, for some considerable time, been funded largely to focus on full time learning for 16-19 year olds. Many students who go to FE colleges may choose alternatives to A levels.
I know this is a bit of a hotchpotch of information, but it may help to explain why there is so little choice with respect to part time learning in a face to face context in FE.