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it's being combined with a similar position, so overall responsibility/workload in the new role is twice what it is in the current job.my role has changed several times at the company -- current one for 2 years.
they're moving to another existing role that was made vacant by someone else leaving
Ok legally your employer can ask you to take on additional tasks if the contract allows for it. The employer should be reasonable though and it may amount to a breach of trust and confidence if you are being given a job that you cannot physically undertake. In particular it would be unreasonable for you to be performance managed if the role is an impossible one to perform.
I would suggest you raise a formal grievance citing your concerns that you are being expected to do a new role. If the contract does not state that you may be expected to undertake additional duties you should point this out to them and state that you are not prepared to take them on.
You are also within your rights to state that you are not prepared to take the job on without additional remuneration to compensate you.