Please do ask the people who know...the CAA. I would be interested to know their answer.
As they have just disposed of their Medical Dept I wouldn't be too sure any more.
Having conducted many Medical Flight Tests, if a person has a medical restriction on their licence requiring a second pilot, then they are not qualified to act as a Safety Pilot.
I was on a unit in the RAF where we had a one eyed pilot and the posters wanted to send us another one eyed pilot. The boss dug his heels in as all pilots were dual seat qualified and he envisaged a situation where both eyes at the front could be on the inside!