You should contact England 's local police NOT HK. You are living and will be protected by law in England. HK cannot do anything legally in HK . If you do not contact local police , anyone will doubt the truth of your story! England is a free democratic country and everyone will be protected by law, where HK is just opposite!
You should report to the local council because I think she may not have HBO LICENCE .I suggest this people should report to the home office to revoke their visa .