You best bet would be train from Kings Cross to Alexandra Palace which is pretty near. The frequency is variable though depending on when exactly you're travelling.
Perfect, thanks! And I have to wait 'til after 19:00 to take my bike on the Great Northern, as far as I can tell?
Weekdays yes, weekends anytime.
@JesperXT started
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You best bet would be train from Kings Cross to Alexandra Palace which is pretty near. The frequency is variable though depending on when exactly you're travelling.