Organisers are backing the use of civil disobedience during the wave of protests, in which demonstrators will "resist the parliament shutdown" in dozens of towns and cities.
Protests are taking place in Newcastle, Birmingham, Manchester, Liverpool, Bristol, Glasgow and Swansea, among more than 80 planned demonstrations due to take place over the next week.
Canon for music and liturgy at Newcastle Cathedral, Clare McLaren, is backing the protests and told Premier why she is demonstrating today in Newcastle, she told Premier: "I thought it was really important to come to the demonstration today because I'm appalled by what seems to be going on.
"As Christians we are called to pray for our city, to contribute to our democratic procedures, and also to pray for our leaders. I am certainly praying for our leaders at this time, but also really appalled that the parliamentary democracy that we're so proud of in this country seems to be being flouted in the way that the prorogation of parliament is doing.
"The people needs to have a say in our future and that's being removed from us and that doesn't seem right to me. So, we have to stand up as Christians for what we believe to be true, and to be good and to be God's well, and for me, where we are at at the moment just is wrong."
The shadow chancellor, John McDonnell, will be among high-profile speakers addressing demonstrators massing outside the gates of Downing Street.
Jeremy Corbyn is supporting the protests saying: "The public outrage at Boris Johnson shutting down democracy has been deafening. People are right to take to the streets – and I encourage everyone to join the demonstrations in London and across the country."
Scotland Yard said: "A proportionate policing plan is in place. Any public order incidents will be dealt with appropriately."
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