Citizens Advice Help to Claim service can support you in the early stages of your Universal Credit claim, from the application, through to your first payment. Including support with gathering evidence needed for the claim, checking entitlements and demonstrating immigration status. 
The service is delivered through local CABs, but there’s also a national phone number and a webchat available.
Eligibility: Open to all Universal Credit Claimants
Phone: 0800 144 8 444