How GP Practices Share Your Information
How does my GP share my information with other health services I'm using?
Your GP practice may use your information to help them to deliver more effective treatment to you, and to help them to provide you with proactive advice and guidance.
Patient referrals
With your agreement, your GP may refer you to other services and healthcare providers, or they may work with other services to provide your care in the practice.
Other services and health care providers will normally tell your GP surgery about the treatment they provide you and your GP or nurse will include this in your medical record.
See below link for more information
http://www.southwarkccg.nhs.uk/your-health/information/sharing/Pages/default.aspx