thanks for that, not me so I asked the person in question and she's chasing the T&C from employer. Its a long term illness that may leave her permanently out (6 mnths so far) so I think the company want to get a permanent replacement in. Her company have asked for a letter from her doctor to say how long, at minimum, she will be out for, they may settle for that rather then force her to visit their doc.
I dont know how their would be conflicting diagnosis but I assume there would be chance of it else I cant see why they would ask for her to see a 2nd doc.