The Psychiatric Nurses' Association says the impact of a strike by 500 ambulance-workers today will be severe.
They're due to walk off the job across the north west for 24 hours from 2pm as part of an ongoing row over union-recognition.
It'll be the second time they've staged industrial action - and have warned more strikes could follow.
The PNA's Tony Gregg says the workers won't be backing down:
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