This statement means that most electrical work must be certified for safety, for which you have two choices:
However, there are certain electrical jobs that are ‘non-notifiable’ which do not require a safety certificate and you can therefore DIY, if you feel you know how.
If in doubt, always seek professional help, or advice from your Local Authority.
Do you know somebody who is improving their home, if so why not share the resources of simplifydiy.com with them.