Yes minor works are non notifiable although they do still require a test cert for example:
Replacing accessories such as socket outlets, control switches and ceiling roses
Replacing the cable for a single circuit only, where damaged
Re-fixing or replacing the enclosures of existing installation components
providing mechanical protection to existing fixed installations.
Work that is not in a kitchen or special location, and does not involve a special
installation and consists of:
Adding lighting points (light fittings and switches) to an existing circuit
Adding socket outlets and fused spurs to an existing ring or radial circuit
Installing or upgrading main or supplementary equipotential bonding