More than 4,000 employees of Hammersmith and Fulham Council could be forced to lose benefits or face the sack unless they accept sweeping changes to contracts.
All council staff who are not teachers or senior management will face new terms and conditions described as 'drastically inferior' by the borough's branch of Unison.
The union received an advance notice of redundancy on Thursday. Any staff refusing to sign the new terms and conditions will not be re-employed.
The council has confirmed to Unison that the new terms and conditions could include:
- Upping the number of days in a working week from five to seven, with no extra pay for evenings and weekends
- Cutting flexibility in the 36-hour flexi-time week
- Slashing maternity leave from 16 weeks full pay to just six
- A 'sickness code' which could lead to dismissal after just three sick periods annually
- Cutting new employees' holiday by two days a year
- Forcing staff to make up time spent at doctor's appointments
- Chopping dependency, compassionate or bereavement leave from 25 paid days to seven.
Hammersmith and Fulham Unison branch secretary Noreen Morris said: "We have faced two years of cuts are struggling to continue to provide effective services with less resources, in many cases covering for colleagues who have already left.
"Senior managers continue to give themselves large pay increases and to employ large numbers of expensive agency staff.
"To basically threaten them with dismissal unless they accept the new terms and conditions is appalling and a real insult to our hard working staff."
The council started a three-month consultation with staff last Thursday to finalise conditions.
A council spokeswoman said: "The main aims are to reduce costs, improve services and bring our terms and conditions in line with other councils. As part of our commitment to becoming an employer of choice, already much change is happening to improve our business focus and the development of staff.
"In return, we are raising our expectations of staff by working with them to embed a culture of continuously improving performance with high attendance at work."