There's no fixed number, and the old 'you always need three warnings' line is a myth. What matters is that the process is fair for the situation. For ordinary conduct or performance, that usually means a warning, a genuine chance to put it right, and clear steps before you get to dismissal.
Gross misconduct is different. For something serious, like theft, violence or a real breach of trust, you can dismiss with no previous warnings, but only after a proper investigation and hearing. The two things that trip owners up: jumping straight to dismissal for something minor, or dragging warnings out for months with no real support. Both look unfair at a tribunal.
Every situation has its own details, and those details change the right answer. For a read on yours, take the free Employee Situation Check or book a call.
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General guidance to help you decide your next step, not legal advice. Employment law changes, so always check the current position for your own situation.