I'm just worried regarding a reference from his current employer they will obviously mention his attendance record !
But he realy realy needs to get out of where he is working now as it's making him so ill and he is likely to walk out very soon.
I think you should probably say yes - don;t know your exact circumstances - is your dh currently taking medication? You could tick the yes box and not give any more details....
It's hard to answer this without knowing all the circumstances.
If the medical questionnaire goes only to Occupational Health then his managers/ interviewers should not see it. OH will probably want a medical report from his doctor if he mentions it, but should only tell the manager whether or not they consider him fit for work and/or any adjustments the manager should make for him.
TBH I would tell. But my sister (who is an employment lawyer) advised in a similar case that whether a candidate tells or not does not affect rights under the Disability Discrimination Act. Whether that is the case or not if the company specifically asks I don't know. Might be worth checking with a lawyer first. OTT maybe but you never know. My husband has long-term depression so I'd say think ahead!
Looking at the question, is there anything positive he can say?
Recent single episode of depression, under medication since whatever date, with no recurrences, for example, would be no issue for most employers IMO.
If it's long-term, then maybe there's a way to emphasise compliance with treatment, continuing to work, anything at all like that?