AND FOUND! Victoria Tower Gardens!!
wiki: Victoria Tower Gardens is a public park along the north bank of the River Thames in London. As its name suggests, it is adjacent to the Victoria Tower, the south-western corner of the Palace of Westminster. The park, which extends southwards from the Palace to Lambeth Bridge, sandwiched between Millbank and the river, also forms part of the Thames Embankment
Security guard saw them a couple min ago
Literally just saw the white male team running past
In garden
TASK