NATIONALIST MPs staged a sensational walkout during Prime Minister’s Questions today in a dramatic escalation of the post-Brexit devolution row — but opponents have accused them of “playing games.”

The SNP’s entire parliamentary party quit the chamber after its Westminster leader Ian Blackford was kicked out by the Speaker for disrupting proceedings.

Mr Blackford had been criticising the “democratic outrage” of the government pushing through EU withdrawal legislation without the consent of the Scottish Parliament, and with only 15 minutes to discuss the effects on devolved administrations.