4 wheel walker/rollator (High Hesket CA11)

Hello, I'm looking for a 4 wheel walker mobility aid for an elderly relative who has Parkinsons Disease. He is becoming really unsteady and I'm worried about him falling, the local Parkinson's club have recommended a walker, ideally with a seat as in photo but seat not essential. If anybody has one available it would be put to good use and I would be happy to collect it, many thanks