Male MPs do not need to wear ties in the House of Commons chamber, Speaker John Bercow has said.
In a break with tradition, Mr Bercow said MPs should wear "businesslike attire" but that it was not essential for this to include ties.
Parliamentary custom is for male MPs to wear jackets and ties in the chamber.
Mr Bercow was speaking after Tory backbencher Peter Bone said he had spotted an MP - who was Lib Dem Tom Brake - asking a question tieless.
.............. "I think the general expectation is that members should dress in businesslike attire," Mr Bercow replied. "So far as the chair is concerned... it seems to me that as long as a member arrives in the House in what might be thought to be businesslike attire, the question of whether that member is wearing a tie is not absolutely front and centre stage."
MPs should not be disrespectful towards their colleagues or the House of Commons, he said, but added: "Do I think it's essential that a member wears a tie? No."
I may be old fashioned but to me this seems to be yet another erosion of standards. Before we know where we are we'll have MPs appearing with 3 days growth of beard which also seems to acceptable nowadays.