Peter Martin's 'Mixing the Malt' arranged for flexible mandolin orchestra/ensemble. The PDF contains the following additional/optional parts :-
Mandolin III in lieu of Mandola, Guitar II in lieu of Mandola, Guitar III in lieu of Mandocello, Guitar iV in lieu of Double Bass, Acoustic Bass Guitar in lieu of Double Bass
The percussion parts, whilst desirable, are also optional.
The piece is playable by just mandolin quartet or flexible mandolin ensemble/orchestra. Click here to listen to a recording of the piece.