In a letter to GMB general secretary John Edmonds, T&G general secretary Bill Morris says his union's finance and general purposes committee has decided to 'withdraw from the position of trade union side secretary for the NJC for local authorities' services' manual workers'.
The letter continues: 'In arriving at this decision, the committee regretted the difficulties that this matter, on which they had not been consulted, had caused.
'In consideration of this matter, the committee were anxious to avoid any repetition and expressed the wish to re-establish joint co-operation.'
Mr Dromey was elected secretary two and a half months ago, ending the GMB's traditional monopoly of the secretaryship. GMB public services secretary Mick Graham moved seats to become vice-chair.
Mr Sonnet said a replacement secretary would have to be elected by the whole council. The GMB holds 12 of the 30 seats on the trade union side of the manual workers' NJC, with Unison and the T&G each holding nine.
Mr Dromey was unavailable for comment as LGC went to press but, on his election in June, he said it was 'time to build unity amongst the local government unions'.