The union would also be prepared to challenge in court any decisions to make staff redundant because of reorganisation.
Unison would press for a national and mandatory compensation package with a ceiling of more than 66 weeks' pay, long-term protection for staff taking worse jobs and guaranteed transfer of all staff under the Transfer of Undertakings (Protection of Employment) regulations.
To achieve such protection, Mr Sonnet advocated the development of transfer procedures which were 'robust and comprehensive'.
Unison believed reorganisation was flawed and should be stopped, said Mr Sonnet. The government's plans would not enhance local democracy, would fail to protect councils' ability to deliver services and did not ensure a fair deal for staff.