Attention was also needed to get the four-legged members of the unit ready before today's event. Six magnificently turned -out horses will each draw a WWI 13 pounder field gun and limber.
More top news
The victim was hit as she crossed the road at a pedestrian crossing in Tulse Hill.
The 24-year-old was unarmed and the incident is not being treated as terror-related.
Some platforms have been taken out of service with disruption expected to continue until the end of the day.