Music
The singer joins Snow Patrol, Will Young and The Enemy on the bill for the string of dates between November 21 and 28.
Nash plays alongside Robyn and The Ting Tings on November 26
Tickets for the Little Noise Sessions go on sale on October 22 and fans must register on Mencap's website beforehand to purchase them.
Artists who have played the charity concerts in the past include Noel Gallagher and Lily Allen.
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