Hi seamus
There are two sets of requirements for the Severe Disability Premium.
First, to be eligible for the Premium, you need to be receiving a qualifying benefit such as the PIP Daily award that you have just received (there are others) and you need to be living alone or considered to be living alone and no one must be receiving Carers Allowance against the qualifying benefit.
Secondly, to be entitled to payment of the Premium you need to be receiving an Income Related benefit such as ESA(IR), Income Support or Pension Credit but not Universal Credit.
If you think that you are eligible then contact the DWP office dealing with your ESA claim and ask to be assessed for the Premium, this requires you to complete an IS10 form which asks about your living arrangements, it should be possible to do this while you are on the phone.
www.gov.uk/disability-premiums/eligibility Gary