Yes, sorry, that's part of what I meant about future sale. I feel that I need to secure my 'investment' in some way, most likely by 'tenants in common'?
Thanks for you reply. Would a legal charge on the property serve a similar purpose, and if so would it be usual to require the permission/agreement of the mortgagor to go ahead with this?
No, my intention is to provide funds that will reduce the outstanding mortgage, I want to secure part of the property against the value that I put in.