Getting professional support with making changes to your diet can be incredibly helpful, especially if you are trying to change your body composition or have a medical condition. An online course can only take you so far and sometimes you need individual attention to help you work through issues specific to your life. Seeing a dietitian can mean the difference between giving up and getting to the weight you want to be.
Dietitians are available via your GP or privately. The title of registered dietitian (or RD) is protected so only qualified professionals can call themselves that and they are regulated by the Health And Care Professions Council. Any other title such as nutritionist or weight loss coach may not have this level of regulation and I would always urge you to see a dietitian where possible. You can find a private dietitian in the UK through the Freelance Dietitians directory website freelancedietitians.org
You can also find me at The London Nutritionist.