Inclusion Criteria:  Participant is willing and able to give informed consent for participation in the study Male or Female, aged 18 years or above. Diagnosed with Type 2 Diabetes Mellitus (confirmed on clinical notes) History of an abnormal neurovascular testing result (typically, 10g monofilament test) Able (in the Investigators opinion) and willing to comply with all study requirements. Willing to allow his or her General Practitioner and consultant, if appropriate, to be notified of participation in the study. Must be willing to refrain from caffeine and tobacco consumption 24hrs before procedures are undertaken. Participants must be willing and able (in the Investigator's opinion) to undertake DN4, Brief Pain Inventory-DPN and Michigan Neuropathy Screening Instrument questionnaires. Able to lie flat  Exclusion Criteria:  The participant may not enter the study if ANY of the following apply:  Patients with neuropathy due to other aetiological causes, such as hereditary, metabolic, inflammatory, cervical and lumbar spine diseases; cerebrovascular diseases; uremia; alcohol use; or toxic factors. All patients with Type 1 diabetes. A positive history of malignancy; connective tissue or infectious disease; Deficiency of vitamin B12 or folate; Chronic renal failure; Liver failure; Glaucoma; Age-related macular degeneration Epilepsy; Severely sight-impaired Presence of a neurological disorder; Inflammatory arthropathies Pregnancy. Any other significant disease or disorder which, in the opinion of the Investigator, may either put the participants at risk because of participation in the study, or may influence the result of the study, or the participant's ability to participate in the study.