I think that there is a case for instant reporting, to your local constabulary, by your GP (or the NHS) of any change to you mental health or wellbeing.

The husband of a work colleague was signed off work (for many months) from the ambulance service with 'post traumatic stress disorder' and yet still retained his 'hunting' semi auto .22 rifle with silencer. The police would apparently not be aware of his mental health until the next renewal, possibly as long as 5 years distant... that doesn't seem right, or entirely safe, to me.