Option 1
Tell the client to F*** off and don't take the extension (no billing)
Option 2
Accept the extension and then inform client a week prior to holiday that you are unavailable for a few weeks (don't tell him its a holiday as you are not a permie) but you will as per contract kindly offer him the option of a subby.
outcome, you bill up to your holiday, client either says on ya bike and serves notice (probably immediate) or accepts you are away and may take up your option
Point is that either way client wont be happy so rather bill more time on Option 2 and then you are contractually covered via the substitute route
Job done
Tell the client to F*** off and don't take the extension (no billing)
Option 2
Accept the extension and then inform client a week prior to holiday that you are unavailable for a few weeks (don't tell him its a holiday as you are not a permie) but you will as per contract kindly offer him the option of a subby.
outcome, you bill up to your holiday, client either says on ya bike and serves notice (probably immediate) or accepts you are away and may take up your option
Point is that either way client wont be happy so rather bill more time on Option 2 and then you are contractually covered via the substitute route
Job done
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