Vintage jobs daughter ring
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Sooner or later you are going to bring in new machinery, substances or procedures which may lead to new hazards. If there is any significant change, add this new hazard to your assessment. You do not need to amend your assessment for every trivial change, or for each new job.
But if any change, or new job, brings in significant new hazards, then you should consider them in their own right and do whatever is necessary to keep the risks down.
And finally, it is a good working practice to review your assessment from time to time, to ensure that the precautions are still working effectively.