Some people in the UK expect to learn martial arts for free. In fact, there are a number of teachers who offer free tuition.
It may be worth looking closely at what is on offer:
What are they offering?
When did the teacher start practicing martial arts?
How long has the teacher been offering lessons?
Who did they learn the art from?
Is the school teaching a recognised martial art?
Do they offer the 8 areas of study?
Are you discovering the essence of the art?
Free does not necessarily mean authentic.
When something has value, people seldom want to give it away for free.