For those interested in how the current situation should actually operate this is the formal response from the NHS body that is responsible for such stuff:
When a Forces or Service dependant patient registers with DMS the GP holding the record should follow the same procedure as they would for a patient leaving their practice and registering with another GP within the NHS.
Once DMS receive the NHS GP records for a Forces patient they will be held in DMS storage. During their time under the care of the DMS the patients NHS records will not be updated, however the patient will have a DMS Service Health care record which will be updated with any current clinical notes received in DMS. Once the patient is discharged from DMS a copy of the service record held by the MOD will be forwarded to the GP with whom they register together with the NHS GP record retrieved from storage. Details will also be sent to the current GP advising them on how to apply for the full service health record with the permission of the patient. Whilst a Forces patient is registered with DMS they can only be seen by an NHS GP on a temporary basis until they have been discharged from DMS. Any clinical information from the NHS GP should be sent to DMS following the procedure for temporary residents.
For Service dependant patients the NHS GP record once received in DMS will follow the patient to whichever DMS medical centre they register with and will be updated by the DMS medical centres as they would be by a GP practice. Once leaving DMS the NHS GP record will be forwarded to their current NHS GP or held in storage until the patient registers back with the NHS. Any clinical notes received by DMS for current DMS patients will be forwarded to their current DMS medical centre. Service dependant patients have the option to register with the an NHS GP without having to wait to be discharged.