The investigator, or authorised designee, will chose the appropriate list based on the participant's centre, HbA1c level (HbA1c < 38mmol/mol or ≥ 38mmol/mol), BMI level (BMI < 30 kg/m2 or ≥ 30kg/m2) and previous response to NB-UVB (achieved remission within 25 exposures during most recent course of NBUVB or not). Those who have not been exposed previously to NBUVB will be placed in the "did not achieve remission within 25 exposures" group.