Urgent!! D;?

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This girl on Instagram wants to kill herself, and has a strong feeling for it. She wants help, and she has a strong addiction of cutting herself. She lives in the UK, and I wanted to help her somehow. I feel so guilty just sitting here doing nothing, and have felt horrible all day because of it. Any type of hotline number for the uk would be helpful! I just don't know what to do, and I feel I should! She made a date to do suicide and won't tell anyone when. She has attempted several times. Someone please list a number or something I can give her to help her