The full message on the school's website from Dr J J Saxton, director of education at Future Academies, said:
I am writing to let you know that having successfully set up and opened Pimlico Primary, Annaliese Briggs has decided to leave Future Academies to pursue other opportunities within primary education.
A new principal of Pimlico Primary has been appointed. Coming from within the group, our new principal is already known to you and your children, and brings over 10 years experience in both early years and leadership.
We are delighted that Annaliese will continue to support Pimlico Primary as it grows by becoming a governor.
More top news
London and the worlds has united on Twitter in defiance of the West minster attack #prayforlondon #wearenotafraid
London was today a city of sirens and half mast flags in the wake of another terror attack.
MPs said they would "carry on" and go to work "as usual" in defiance of the terrorist attack outside the Palace of Westminster.