ALL 2,506 polling stations in Wales's 22 local authorities will open at 7am tomorrow, with votes able to be cast until 10pm.

This afternoon the Electoral Commission said that, out of the 2,289,042 eligible electors, 372,586 would be making their decision by post.

The referendum asks people whether Wales should be able to pass its own laws in its 20 devolved areas - as opposed to the existing Legislative Competence Order (LCO) system.

Currently, for an LCO to come into effect it has to be approved first by AMs in Cardiff Bay, before being passed by The House of Commons, The House of Lords and finally being given Royal Assent by The Queen.

Yes campaigners say the current system is too slow, inefficient, as well as costly. However, No campaigners argue the Assembly has not yet "won the right’’ to gain more powers.

In the latest ITV Wales poll, in which 1,036 people were surveyed, more men were likely to say yes (71%) than women (66%), with the region most in favour of the proposed change being South Wales West (72%), which includes the city of Swansea and towns such as Llanelli and Carmarthen.

Nick Powell, head of politics at ITV Wales, said the latest batch of figures showed the support for the Yes campaign had risen in recent weeks.

He added: "Those in favour almost outnumber those against by a margin of two to one.

"The biggest change is that the number of people who say they don't know enough about the referendum or won't vote has almost halved.’’ First Minister and Welsh Labour leader Carwyn Jones welcomed the poll figures.

He said: "This is yet another encouraging poll and all the indications ahead of the vote are positive. However, we are taking nothing for granted.

"We want every yes voter to come out to deliver a resounding result in this referendum. No one should wake up on Friday morning and say to themselves, 'I wish I'd voted Yes'.’’