I was sent home pending an investigation with a strong beleif of termination. Since then I have had increased anxiety and depression seeking medical i have a past history of this.
Can they legally terminate if I'm on medical leave.

If your employer was aware of your medical issues and those medical issues were a factor in the issue being investigated you may have some protection from termination. However this situation would be dependent on numerous factors, including the severity of the issue being investigated and the outcome of the investigation. Please contact us at the number below if you would like to book a consultation which would provide a detailed analysis of your situation.