The government has been urged to set aside more money to help public services cope with a possible rise in immigrants from Eastern Europe.
The Institute for Public Policy Research says housing, the NHS and policing will all be stretched if large numbers arrive from Bulgaria and Romania when restrictions lift next week.
ITV News Political Correspondent Carl Dinnen reports from Harrow, one of London's most diverse boroughs:
More top news
There will be a top temperature of 27 Celsius (81 F) in the southeast.
23 people were injured in Monday’s incident.
Stephen Paddock killed 58 people and injured hundreds more after opening fire from a suite in the Mandalay Bay in October.