John McDonnell, Convenor of the RMT Group of MPs, said: “The RMT Parliamentary Group is absolutely devastated by the tragic loss of Bob Crow, and send out deepest condolences to his family and friends and the members of his union, the RMT.”

“Bob was one of the finest trade unionists we have ever seen. He was simply loved by his members and re-elected time and again.”

“He was an outstanding socialist and a tireless campaigner for a better transport system not just for his members but for all the public. He was a political giant and will be sorely missed.”