Brian Cox and Rob Delaney will speak at a rally in London in support of the SAG-AFTRA strike

'Succession' star Brian Cox and 'Catastrophe's' Rob Delaney are among confirmed speakers at a rally in London in support of the SAG-AFTRA strike.

UK Actors' union Equity revealed plans earlier this week for two large protests on Friday in solidarity with the actors' strike. Twin rallies will take place at midday local time in Leicester Square in London and Media City in Manchester.

Speakers scheduled for the London rally so far include Cox and Delaney as well as 'The Pact' and 'Alex Rider' star Rakie Ayola, Equity general secretaries Paul W. Fleming and Lynda Rooke, and Bectu boss Philippa Childs. MP John McDonnell is also expected to speak.

Many British actors are expected at the protest in support of their American counterparts. Those confirmed so far include 'Mission: Impossible 7' actor Simon Pegg, 'No Time to Die' star Naomi Harris, 'The Crown's' Imelda Staunton and 'Downton Abbey' actors Jim Carter and Penelope Wilton. Many more are likely to turn up, given the strong solidarity in recent months for other players across the pond. As previously reported by Variety, many of the issues at the center of the US actors' strike - streaming residuals, artificial intelligence and self-recording being the main concerns - are also prevalent in the UK.

Following the SAG-AFTRA strike, Equity was quick to emerge with advice for its 50,000 members. However, the union has made it clear that while it stands in solidarity with its US counterpart, it is not legally allowed to follow suit with strike action.

"If Equity encourages anyone to join the strike or not to cross a picket line, Equity itself will be acting unlawfully and therefore subject to damages or injunctive relief," the union said last week.

The organization explained that due to anti-union laws in the UK, "SAG-AFTRA members currently working under an Equity U.K. collective agreement should continue to report to work."

Friday's rallies are open to Equity members, performers, union members, the press and "anyone who wishes to show solidarity with striking SAG-AFTRA workers".

Equity is the 12th largest union in the UK and represents actors, singers, dancers, designers, directors, managers and voice artists, among others.