The Royal Brompton is the best heart hospital so you will be in good hands there. I would hope they send copies of your recent scans to the hospital so you don't have to have them all over again.
When I next have surgery the Brompton is the place where I think I wil get the best level of aftercare and nursing which is most important after heart surgery, as the hospital is dedicated just to heart and lung.
The food is very good too - at least it was when I was a day patient there in June. Of course they do all the low fat stuff but I managed to get a very good omelette with cheese and fresh green vegetables - and I asked for butter to put on them, apparently they try to source the veggies locally and try to get organic ! That's what I read any way. Mind you, you might not feel like much food after your op, at least not for a few days. They will obviously be aware of your diabetes when it comes to the surgery and how that will affect your diabetes.
Do keep us posted !
Atypical Type 2, thin, not insulin resistant, diagnosed March 2007. Very low carb (30 - 50g per day) Paleo diet and exercise - Prandin (Repaglinide) 0.5mg. Aortic Valve Replacement Jan 2014, Osteoporosis, Small airways disease, probable coeliac - Strontium Ranelate 2g/d, Omacor 2g/d, vitamin K2 300mcg/d, Aviticol (vit D3) 20,000 IU every week, Qvar 100 2/day.
Current HbA1c 33 Current total cholesterol 7, HDL 3.5, LDL 3.2, triglycerides 0.4