http://www.tamesidecab.org.uk/Global/Waiting%20for%20Credit%20PDF%20final.pdf

Council tax reduction

2. The Universal Credit claim should include a question asking if the person also wants to claim council tax reduction (CTR) – if they do then the date of the claim for UC should be taken as the date of the claim for CTR and their details automatically passed on to the Local Authority so there is no need for a separate application or verification