Start with a hearty hotel buffet (easiest for 9) or the iconic Regency Cafe for full English; both offer quick service to get you out early for attractions.
Explore the highlights of the Abbey (royal coronations, Poets' Corner) — the Abbey opens at 9:30am on most days; book timed-entry tickets for a group to avoid queues.
World-class antiquities with free entry to the permanent collection (10:00–17:30); plan 1.5–2 hours to see highlights like the Rosetta Stone and Elgin Marbles.
Historic fortress, Crown Jewels and medieval history; opens typically at 9:00am — book tickets/timers for groups to avoid queues and use a Yeoman Warder tour if available.
Short Tube ride to Borough Market for an unbeatable range of street food and local produce; stalls operate roughly 10:00–17:00 — great for groups who want choices.
For skyline views choose the free Sky Garden (advance booking required) or The Shard viewing platform (paid). Both require pre-booking for a party of nine.
Take the Thames Clipper from Embankment/Westminster to Greenwich (about 30–40 minutes); group Oyster/contactless fares apply — the boat ride is scenic.
Allow appropriate transfer time to Heathrow/City/Gatwick depending on flights — plan at least 2–3 hours for international departures from central London.