Hi and thanks for your question,
If she is suffering from these conditions, it would be worthwhile to consult a cardiologist
, get some medication for him before you start arranging for treatment or medical evacuation to the UK. This might take some time.
I would suggest the Mayo Clinic in the USA, with an indisputable expertise in cardiology and rheumatology. You can get information and communicate with your home physician to prepare a reference letter.
Thanks and best regards,