The Queen will visit Lords cricket ground today ahead of the second Ashes Test between England and Australia.
The monarch will meet the players before play gets underway at 11.15am.
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The violence began after a counter-protester allegedly doused a female rally organiser with pepper spray.
As temperatures climb through the day, the warmest spots are likely to be across western parts of Northern Ireland and western Scotland.
Boris Johnson and Amber Rudd have both criticised social media giants for failing to detect and remove extremist material online.