Op called off!
Been to see my cardiologist today (regular check up) and she has insisted that any op needs to be performed in a major hospital with full emergency facilities. Also she wants to personally vet the anaesthetist. All just in case like

Probably going to be done at UCH in London now.
I also mentioned I've been feeling a bit poorly lately. She immediately arranged a blood test and said I must go and see my GP ASAP.
It's like having a new mum