Vine Medical Centre Policy on Tests from Private Doctors

If general practices receive requests from private providers to arrange tests or investigations, it is important to note that complying with such requests - regardless of the GP’s management and treatment of the patient - is outside the scope of NHS primary medical services.
Therefore, a GP provider should only carry out investigations and prescribe medication for a patient where it is necessary for the GP’s care of the patient and the GP is the responsible doctor. If the GP considers the proposed investigations to be clinically appropriate, is competent to both interpret them and manage the care of the patient accordingly, then the GP may proceed with arranging the tests or investigations.
However, if the GP does not have the knowledge or capacity to undertake these actions, they should decline to organise the investigation and advise the patient and the provider that the services do not fall within NHS primary medical services and to make alternative arrangements.
For this reason Vine Medical Centre will not arrange tests when advised by private providers if this is not part of their normal NHS care. This could include but is not limited to tests such as blood tests or ECGs before private providers initiate medications, blood tests advised by nutritionists or other non medical professionals, and blood tests and other investigations requested by work HR departments, overseas doctors, and private secondary care clinics. 
Patients are of course entitled to access their medical records, so GPs can provide access to the results of any such investigations for the patient to take back to the private provider.
https://www.bma.org.uk/advice-and-support/gp-practices/managing-workload/general-practice-responsibility-in-responding-to-private-healthcare