Hello, I am Keith, one of the experts on Just Answer, and pleased to be able to help you with your question.
Your income from the Rent a Room Scheme will still be tax free providing it is within the threshold [7500 pa]. It does not have to be declared on your self assessment tax return.
Here is a link to the Gov UK web site on the subject should you want to read the chapter and verse:
I do hope that you have found my reply of assistance.
Please be so kind as to rate me before you leave the Just Answer site.