Many (in fact most) independent schools do not publish answers to use with their sample 11+ papers. The schools you mentioned do not publish the answers which is why you cannot find them on this website too. Usually, the schools indicate how many marks are alocated to each question/section but if you want to use them, you will need to mark them yourself.
Sorry that we cannot help you. I did check the schools’ websites for the ones that you listed and there are plenty more sample papers available but no answers.