Introduction: The coronavirus pandemic has swept across the United Kingdom (UK). Given the ever-evolving situation, little is known about the repercussions of coronavirus and the subsequent lockdowns for children diagnosed with Autism Spectrum Disorder (ASD). Therefore, this study explores the social-communicative impact of the first lockdown (March 2020 -- July 2020) in the UK and the return to school period (September 2020 -- October 2020), following prolonged disruption to routine, in children diagnosed with ASD. Methods: Parents of autistic children completed 2 separate online surveys following the first lockdown in the UK (n = 176) and also when children returned to school following the summer break (n = 54). Results: The results suggested that self-regulation skills (p < 0.05) and co-operation skills (p < 0.05) were most affected over the course of the lockdown. Children's physical activity levels were perceived to significantly increase during the return to school (p < 0.0001), which was associated with better social-communication outcomes (p < 0.05). Conclusion: Future work is needed to confirm and explore the findings. Such work could be implemented to protect and improve the social-communicative outcomes of autistic children.