Mould On Roof Interior

Hello MX-5 folk.
I bought my first MX-5 (a NB model Eunos) about 3 weeks ago. I don't know the underlying reason for its formation but there is mould on the interior of the roof. I have not noticed any leaks or dampness since I bought the car.
I'm looking for advice on how to remove it. Vanish was suggested by a relative. Does anyone have any helpful suggestions?
Here are some photos:

Edit: Fixed the photo links (for now).
I bought my first MX-5 (a NB model Eunos) about 3 weeks ago. I don't know the underlying reason for its formation but there is mould on the interior of the roof. I have not noticed any leaks or dampness since I bought the car.
I'm looking for advice on how to remove it. Vanish was suggested by a relative. Does anyone have any helpful suggestions?
Here are some photos:
Edit: Fixed the photo links (for now).