Your OH will have to make sure he declares the depression and the insurance company will probably want to take a report from his GP - that's what happening to me at the moment, and I am taking out a policy to cover my mortgage. Some 40 years ago I had a period of clinical depression and unfortunately I've been rated up on it ever since for life cover, 25% above the normal quoted premium last time. I am hoping that this time the GP's report will show I have had no recurrence for many many years and they will treat it as closed, but I am not hopeful.