I have never been in a MH nor do I know the triggers for hospitalization in the UK but
I imagine that hearing voices and threats of harm to oneself or others logically sound like that would be alarms or indications for immediate intervention. I would want the proper help under any circumstances, so that being 100% honest is always the way to go, especially when it comes to mental health. You MUST BE HONEST with the professionals if you are to get a proper diagnosis and proper medcation and care. Please, you do need help,you need it NOW, and remember if it means a MH, it's not a lifetime commitment,rather a temporary solution until they have you taking the meds you need to live as full a life as possible- as quickly as possible. Be good to yourself, and especially when it comes to health,be it mental or physical, I've learned that you MUST ALWAYS BE HONESTif you want the best professional care. G-d Bless.......