Most of George Calombaris's restaurant empire goes into voluntary administration

Move follows underpayment scandal that resulted in staff being back-paid almost $8m in wages and superannuation

Celebrity chef George Calombaris has put much of his restaurant empire into voluntary administration.

Advisory and investment firm KordaMentha has been appointed as administrators of 22 companies in the Made Establishment Group, which KordaMentha says operates 12 restaurants and food venues in Melbourne.

Related: George Calombaris: former MasterChef judge says there's 'no excuse' for underpaying workers