A year ago today with “the Vow” David Cameron, Nick Clegg and Ed Miliband pledged significant extra powers for Scotland if it rejected independence.

Much has changed in 12 months, with significant milestones towards further devolution met along the way.

The cross-party inquiry into the issue, the Smith Commission, was set up within weeks of the referendum result.

By the end of last November it had, as promised, delivered the Smith Agreement, the basis of the Scotland Bill currently going through Westminster.

The public was promised draft legislation on more powers before Burns Night this year, and that was delivered too, days earlier than pledged.

The Scotland Bill still has significant stages to pass in both the Commons and the House of Lords.

But the Conservative Government is keen to have in passed within months and indeed made it one of its first properties after May's General Election.

Tory insiders are pleased that this will allow the party to argue for tax cuts during next year's Holyrood elections.

But some critics accuse the party of also moving swiftly as a way to defend itself against charges that it is being unfair to Scotland as it seeks to restrict Scottish MPs voting rights in the Commons, under so-called ‘English votes for English laws’.

There are other, well-known, issues as well, however.

The SNP, who had been part of the talks, almost immediately said that Smith Agreement did not go far enough.

First Minister Nicola Sturgeon has called for greater economic powers, so-called Full Fiscal autonomy (FFA), to be awarded to Scotland.

Without FFA, the SNP argue, the Scottish Government cannot reinvigorate Scotland's economy as it would wish.

With FFA, however, pro-Union parties argue, Scotland gets all of the pain and none of the gain, with a new multi-million pound black hole in its finances created by being outside much of the pooling and sharing of the UK's resources.

Other issues remain in the wings as well.

The new Scotland Bill includes includes much greater devolution of income tax to Scotland.

This builds on the new Scottish rate of income tax (SRIT) that will be introduced later this year as a result of the 2012 Scotland Act (remember that?).

But there are potential clouds on the horizon already.

A report last week warned that problems with the system could leave the Scottish Government unable to confirm the new rate in January as expected.

Every household in Scotland is also soon to receive a letter telling them about the changes - amid fears that many are in the dark.

The Smith Commission also called for further work to look at the possible devolution of the always contentious issue of abortion.

The Scottish Secretary David Mundell has hinted that he could move to transfer the power in the Scotland Bill.

The SNP has said that it does not intend to reform the current law but that it wants control over terminations to be in the hands of Scottish ministers.

As one SNP source said: “We are in the more powers business”.

On the other hand, women’s groups and other have urged a more cautious approach.

One year much has changed along the journey, but the overall final destination still appears unclear.