Shared Owners are people who have purchased an equity share in a shared ownership property and pay rent on the remaining share.
Shared Owners rights and responsibilities are outlined in their Lease. The Lease is a contract which sets out the terms and conditions to be observed by both you and Marches Housing Association. It will state the obligations in relation to paying rent and service charges, maintaining the property and describe the arrangements for purchasing additional shares in your home (this is also known as staircasing).
Although you have not purchased the property outright, you have all the normal rights and responsibilities of a full owner occupier. You are, therefore, advised to ask your legal adviser as well as Marches Housing Association if there are terms you do not understand.