I'm glad that you have put your mistakes behind you and are doing well with the OU. The courses are indeed demanding, and so an OU degree is rightly regarded as valuable. (Disclaimer: I did my PhD with the OU, as well as an undergraduate module in Spanish. The only thing wrong with the Spanish course was that it did not attract any gorgeous young women!)
In terms of your question, it is unusual for undergraduates at any kind of university to get involved in research. If you want a research career then that is great as a goal. For now, the best way to pursue it is to be as good an undergraduate as you possibly can. Networking is important: your first resource for this is the electronic conferencing that the OU provides, as well as your tutors and the other students who turn up for tutorials. If you live near a "bricks and mortar" university then it is likely to hold seminars and student-organised meetings related to your subjects, and people like you are always welcomed at events like this. (Ask your tutor, who may well work in such a department, or simply visit the web pages for the relevant bits of your local university and make contact with anyone who seems either interesting or helpful.) You might also like to make contact with the librarian there: most university libraries allow members of the community access for reading and reference, and lots of interesting events get advertised by displaying posters in uni libraries.
Good luck with everything!