Letters sent using campaign group’s template as Keir Starmer indicates Australia-style move being considered

MPs’ inboxes have been flooded with letters calling for an Australia-style social media ban for under-16s, as the prime minister indicated such a move was being considered.

More than 100,000 people have contacted their local MP since the grassroots organisation Smartphone Free Childhood launched an email campaign on Tuesday evening with a template calling for “reasonable, age-appropriate boundaries”.