The DWP have taken over responsibility for investigating Housing Benefit fraud, and if your referral relates to or has elements of this, you will need to contact the DWP National Benefit Fraud Helpline by the following methods:
Helpline: 0800 854 4400 (textphone 0800 320 0512)
Website: gov.uk/report-benefit-fraud
Post: NBFH, PO Box 224, Preston, PR1 1GP