Hannah from the Futurelearn contacted me recently to let me know about courses that the British Council have free IELTS preparation courses available. It says that there is a price on the page BUT it’s free if you only want access to the course for 5 weeks. You only pay if you want to see the videos, hear the audio and join the forums all the time. You can get a certificate that you joined the course if you pay more.
I have never used these courses but I have taken other courses on Futurelearn before, and it’s free!