for an average Band D council tax payer. Since his first budget in 2017–18, Mr Khan has increased the Greater London Authority's council tax precept by 31%, from £280 a year to £363.66 a year for a Band D property. On the same day, Khan also ordered London residents to cease travelling after he declared the COVID-19 crisis in London a "major incident" with "out of control" spread, as infection rates for London were estimated to be around 1 in 30, with highs of 1 in 20 in some parts of the city. European Union and Brexit In the buildup to the referendum on the UK's continuing membership of the European Union (EU), Khan was a vocal supporter of the "Remain" camp. He agreed to attend a Britain Stronger in Europe campaign event with the Conservative Prime Minister David Cameron to demonstrate cross-party support for remaining within the EU, for which he was criticised by Labour Shadow Chancellor John McDonnell, who claimed that sharing a platform with the Conservatives "discredits us". After the murder of MP Jo Cox during the campaign, Khan called for the country to "pause and reflect" on the manner in which the Leave and Remain camps had been approaching the debate, stating that it had been marred by a "climate of hatred, of poison, of negativity, of cynicism". Following the success of the "Leave" vote, Khan insisted that all EU citizens living in London were welcome in the city and that he was grateful for the contribution that they made to it. He endorsed the Metropolitan Police's "We Stand Together" campaign to combat the rise in racial abuse following the referendum, and later backed the "London is Open" campaign to encourage businesses, artists, and performers to continue coming to the city despite Brexit. On 20 October 2018, Khan marched with People's Vote protestors from Park Lane to Parliament Square in support of a referendum on the final Brexit deal. The march was started by Khan and featured speeches by Delia Smith and Steve Coogan. The organisers of the march said that almost 700,000 people took part. Police stated that they were unable to estimate the numbers involved and a later police debriefing document prepared by Khan's Greater London Authority estimated the number to be 250,000. On 23 March 2019, Khan took part in the Put It to the People march in London in support of a