With workers from McDonald's, TGI Fridays, UberEats and Wetherspoon on strike, we ask them why.
The fast food demonstrations are also happening in the US, where they have attracted some high-profile political supporters, including the leftist Senator Bernie Sanders.
He has written to the head of McDonald's, arguing that the firm should follow Amazon's example and raise its minimum pay to $15.
Sen Sanders released the letter ahead of a demonstration at the company's headquarters in Chicago, where organisers are expecting more than 1,000 people.
Rallies are also planned for other key political battle grounds, including Florida.
The protests have been organised by labour unions and other activists involved in the "Fight for $15" campaign, which is aimed at boosting wages to $15 an hour.
BBC Radio 4
Today workers from McDonald's, TGI Fridays, Wetherspoons, Uber Eats, Deliveroo and driving app Uber will stage strikes in separate disputes over pay and union recognition.
So far, scale of the strikes is small, "but growing" says Frances O'Grady, general secretary of the Trades Union Congress (TUC).
She says: "What's interesting is that we are seeing young workers in particular from a whole range of different hospitality employers but also these new tech monopolies that are using very old fashioned forms of exploitation and more and more young people joining their unions - GMB, Unite, the Bakers, Food and Allied Workers' Union and the Union for Independent Workers.
She says: "In the end, Jeff Bezos, the richest man in the world who runs Amazon, is not going to listen to workers individually. We have to combine our collective bargaining power."
Cattle that escaped from an overturned trailer fled into a McDonald's drive-thru.