For general advice about bereavement you might find the NHS choices article on bereavement useful.
If you are looking for advice about dealing with the practical aspects (such as legal issues) of someone dying then try the Bereavement Advice Centre.
The Leeds Bereavement Forum collates allot of information on the services available in Leeds.
In collaboration with Leeds City Council, Child Bereavement UK is offering support for children, young people and their families, who have been bereaved of someone important in their life. The service is for Leeds families with young people up to and including age 18, and up to 25 with SEND, who are in need of bereavement support.
There are also several organisations and charities that provide specialist advice and support to those that have been bereaved: