Great Marlow Swans | 12 followers on LinkedIn. Great Marlow Swans is a platform of help and support for the coaches and children involved with GMSBC . | Great Marlow Swans has been set up in order to provide the coaches and children involved with GMSBC a platform of help and support. We are a group of committed parents, helpers and carers with a passion for the development of our children in a sport that they love. We are now a registered charity and besides financial support we also aim to help out the club in so many other more subliminal ways.