When may you wait in the area marked with a cycle?

Explanation: At some traffic lights there are advance stop lines, where cyclists can position themselves ahead of other traffic.
When the lights change to amber or red you should stop at the first white line. Stay out of the marked area, as this is for cyclists only.
However, if you've crossed the first white line when the signal changes to red, you must stop at the second white line even if you're in the marked area.
Allow cyclists plenty of time and space to move off when the lights change to green.

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References: The Official DVSA Guide to Driving: Section 6, Highway Code: Rule 178