PIP Review phone assessments

Hi does anyone have thoughts or experience of PIP Review phone assessments being done through an interpreter? I am currently filling in a review form for a friend who has great difficulty answering questions on the phone as his 1st language is not English.....Polish. Because of his mental conditions he also gets very confused on the phone. I am very concerned if he is phoned and assessment is done in English he will not understand and will lose some or all of his PIP.
Thanks

Thanks... I have helped him in past at FtoF assessments but not with phone assessments. If I put on Review form...' if phone assessment necessary I will need an interpreter Polish language. I have great difficulty understanding English on the phone and because of my mental health conditions I get very confused' do you think they will take note of the request and arrange for an interpreter?

Thank you Gordon...you are always so helpful I very much appreciate