To finish off the wild guessing of what happened , as my colleague was on base leg the controller issued landing clearance and wished him a ‘good night’. His response was I’ve got another hour of circuits yet, no response came back but he got that telephone call instead.
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Am I being slower than normal? I am still confused about the scenario. Are you saying that the circuit detail was covering the transition between day and night? If so, this could well go some way to explaining the ATCO's comment about the need to separate.
You are obviously not comfortable revealing names and location but please explain the WHOLE scenario so we can ALL learn from this.