If that fails then, for example, follow the link here to your nearest Spire hospital.
Find a Spire Hospital
Once found, open and go to 'find a specialist'.
Search for cardiologists.
Telephone private appointment secretary and make booking for stress ECG, being quite sure she understands what it is for and that the Bruce Protocol will need to be followed.
Expect to pay, for hospital, cardiologist and treadmill assistant, something in the order of £300-350.
Get the cardiologist to give you or send you his report, a copy of the trace and the original trace.