JP,
I realise I'm not a commercial,but I had a similar problem when getting my ppl two years ago,the ECG showed a branch blockage,apparently it's very common.
I needed 24 ECG,the Treadmill and Echocardiogram,all carried out privately at our county hospital.
Off the top of my head the consultant fee was £350 and hire of equipment £300.
It was all OK and, have not needed another one and just have the ECG at my annual medical.
Lister