All the best for tomorrow moley. Sure you have the strength to do it, and that the police will show sensitivity and kindness for what they know is a very difficult thing to do.
Please look after yourself. If you're not getting any help with some of the thoughts and feelings you have, may be worth seeing if there's some available for you so you have a wee bit of support there for yourself right now. (GP, Community Mental Health Team, as you're in Britain the police may offer some support too via victim support, so it's there if you want and/or need).