The official outfitter for the Junior School and Nursery is Schoolblazer.
John Lewis momentarily stock both school-specific and generic uniform items online but the availability of items will become more and more limited as stocks sells out. In the meantime, all items which they currently have in stock can be ordered on their website. This will include school blazers which, unfortunately, will not be available from Schoolblazer until June 2024.
Junior School Uniform and Sports Kit lists