Four more MPs’ names have apparently been added to the letter sent by Tory backbencher John Baron to the Prime Minister this morning. It asks him “to place on the Statute Book before the next General Election a commitment to hold a referendum during the next Parliament on the nature of our relationship with the European Union”. ConservativeHome broke the news of this earlier, but now Guido has got hold of the full text of the letter:

For some reason John Baron is refusing to name who has signed. If you know, you know what to do…