My dh works in a garage.There is serious , inadequate exhaust extraction.It is always full of exhaust fumes.Management don't comply with health and safety. He has worked in this environment for20 years and has been I'll with lethargy, dizziness,exhaustion for 5 years.To top that he had a cancer diagnosis 2 years ago.Other workers are falling I'll Complaint s fall on deaf ears. Apart from going to his gpWhat can he do ? Thank you .