A randomised controlled study of a

INTERVENTION: Pre‐operative intervention involving review of diabetes treatment, medication and diet. Each person will be assessed by the consultant endocrinologist and their management tailored accordingly by the diabetes nurse consultant and dietician. The pre‐operative intervention will occur from their visit to the pre‐admission clinic to the time of their six week post‐operative visit to out‐patients (a total of 12 weeks approximately). CONDITION: Cardiovascular disease Diabetes PRIMARY OUTCOME: HbA1c‐ this is assessed every 12 weeks by a venous sample blood test (glycosylated haemoglobin). A pre‐operative test 6 weeks before cardiac surgery and a repeat 6 weeks after surgery will allow a comparison of HbA1c levels to be made. SECONDARY OUTCOME: Mastery of diabetes using the Diabetes Empowerment Scale‐Short Form questionnaire (DES‐SF) Problem Areas in Diabetes questionnaire INCLUSION CRITERIA: diagnosed type 2 diabetes mellitus ‐HbA1c between 6.5% and 10%* ‐age 18 years to 79 years ‐ the capacity to give and accept informed consent to participate in the research ‐attendance at pre‐admission clinic ‐ scheduled cardiac surgery (coronary artery bypass surgery +/‐ valve surgery)