The new helipad - London's second and the first in South London - will support air ambulances bringing the most seriously injured casualties for emergency treatment at St George's, which provides the Major Trauma Centre for the South West London and Surrey Trauma Network.
Heather Jarman, Clinical Director for Major Trauma at St George's Hospital told us which patients will benefit from the new helipad.
More top news
In a wide-ranging Peston on Sunday interview, he said Parliament security needs reviewing and the PM's counter-terror strategy is flawed.
The terror attack carried out by Khalid Masood at Westminster that left four people dead lasted less than two minutes say police.
Two knives were found at the scene in Islington, North London, and the suspects fled on foot before being arrested.