I googled "free paralegal courses UK" and here is a link that might be helpful. The courses can be completed in 20 hrs. Most are US universities but would be applicable in the UK, for instance these two:
1- Successful Negotiation: Essential Strategies and Skills
University of Michigan offers the free online course Successful Negotiation: Essential Strategies and Skills via the website Coursera. It’s ideal for the paralegal whose tasks include communicating with clients, court representatives, and lawyers. This course introduces students to the four steps to successful negotiation:
Prepare
Negotiate
Close
Perform and Evaluate
The class is 100% online, offers flexible deadlines, and takes approximately 16 hours to complete.
Online Course Website
2 - Think Again I: How to Understand Arguments
Think Again: How to Understand Arguments is the first of four free online courses offered by Duke University via Coursera. It’s helpful for any paralegal who routinely reads, hears, and deciphers legal arguments. This beginner-level online class discusses how to identify and analyze arguments made by other people, and how to construct one’s own arguments. The class is taught 100% online, has flexible deadlines, and can be completed in approximately 16 hours.
There are others on the site that look promising.
www.online-paralegal-degree.org/free-online-courses-for-paralegals/
My other suggestion would ask that question at ovarit.com and also at gender critical on saidit.net