For those new to mediumship readings below is a link to a YouTube video of Veronica Jenkins giving live direct (she goes direct to the person the Spirit contact is for) to order (she asks people to say who they would like her to link with) evidential (she gives evidence of who the person in spirit is) readings.
I define Mediumship as a being able to give evidence to the sitter of their loved one in Spirit. It is different from psychic links which is based on picking up the energy around the sitter and being able to infer things about their life from that energy, psychic readers will often use tools like cards, ribbons, bones, runes, flowers (basically a good psychic reader will be able to use anything lol).
Evidence can be physical description of the person in spirit, the personality of the person, memories from their life such as how they passed, names of people around the person in spirit, dates of events in their life, specific memories of events or profession or where they lived.