In England and Wales, notifiable electrical work in homes, such as a new circuit or a consumer unit change, falls under Part P of the Building Regulations. Electricians registered with a competent person scheme like NICEIC or NAPIT can self-certify that work, and the customer receives a Building Regulations compliance certificate. That is exactly what a careful homeowner is checking for when they search “Part P electrician” or “NICEIC approved electrician”.
A scheme logo tucked into the footer does little. Move it up: registration number beside the phone number, the logo on every service page for notifiable work, and a link to your entry on the Electrical Competent Person Register so anyone can check you in seconds. Say in plain words that you notify the work and send the certificate, because that sentence answers the question the customer was too polite to ask.
If you hold other credentials, give each one a job on the page it relates to: OZEV authorisation on the EV charger page, MCS on the solar page, TrustMark if you are registered. Credentials scattered on an “About us” page do far less work than the same logos next to the service they prove.