Two thousand vacancies for foster carers in London. Become a foster carer with Simply Fostering. Welcome to Simply Fostering. We have the answers to your questions about Fostering and how to become a Foster Carer. Simply Fostering is not a Fostering or Foster Care Agency, we are an independent service designed to give you choice and to help you to 'get it right first time'. We provide advice, practical help and our expertise to find the right Fostering Agency for you.