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Write to the desk

Name the period and the channels if you can. A written reply usually leaves the desk within two working days.

A quiet office interior with a long table where a briefing might be held
Briefings are booked after the records are listed, not from a blank calendar.

If you already have a quote in hand, reply to that email rather than sending a second form. Telephone if a courier or a same-week collection on Pekini Avenue needs arranging.