You can apply online ( www.gov.uk/claim-compensation-criminal-injury/make-claim ) or on the helpline (0300 003 3601; Relay UK 18001 then 0300 003 3601). You can apply for compensation even if your attacker is unknown or has not yet been arrested.

Applications should be made as soon as possible after the incident and must normally be received by the Criminal Injuries Compensation Authority within two years of the date of the incident. This time limit may be extended only in exceptional circumstances and where it is clear that the application can be determined without further extensive enquiries; you should provide the reasons for any delay with the application.
Criminal Injuries Compensation Scheme , paras 87 & 89

Responsibility for making a case for compensation lies with you, which means that you need to provide the Authority with the evidence necessary to decide your case. Where appropriate, the Authority will ask you to provide medical evidence. If there are costs