After the SNP voted narrowly [2] in favour of abandoning its 30-year-old policy of opposition to Nato membership at its conference last weekend (see James Maxwell's recent piece [3] for more on the background to the dispute), two of the party's MSPs, John Finnie and Jean Urquhart, have just resigned [4] in protest. In their resignation statements, both argue that the party cannot support membership of a nuclear-armed military alliance whilst simultaneously demanding the removal of Trident from Scottish waters.

John Finnie said:

I cannot belong to a party that quite rightly does not wish to hold nuclear weapons on its soil, but wants to join a first-strike nuclear alliance.

Although I envisage that I will continue to share common ground with the SNP on many issues, I cannot in good conscience continue to take the party whip.

Whilst Jean Urquhart said:

The issue of nuclear disarmament and removing Trident from Scotland's waters is a red line issue for me, and I could not remain committed to a party that has committed itself to retaining membership of Nato.

We are both steadfast in our belief that Scotland should be an independent country, and will actively and positively campaign for a yes vote in 2014. We believe in an independent Scotland, not a Nato-dependent Scotland.

Significantly, their resignations mean that the SNP now has a majority of just one in the Scottish Parliament. The party won 69 seats in the 2011 election (giving it a majority of four) but lost one backbencher when Tricia Marwick became Presiding Officer and lost another when Bill Walker was suspended from the party over allegations of domestic abuse. The departure of Finnie and Urquhart leaves it with 65 out of 129 seats, a majority of one. However, Alex Salmond, who has suffered the first major revolt against his leadership since the party's remarkable victory in 2011, will hope that he can continue to count on their support in most votes as independents.

In response to their resignations, the SNP leader said:

I'm saddened that Jean and John have decided to resign from the party. They have been excellent servants to the SNP, and I'm grateful to them for their tireless efforts.

We had an excellent and democratic debate at party conference last Friday, and agreed a policy of reaffirming our opposition to nuclear weapons as a non-nuclear member of the Nato alliance - a position that will be accepted by the party as a whole.

Jean and John have indicated to me that they will continue to support the Government from the back benches, and I welcome that. I also look forward to working with them both in the campaign to achieve a Yes vote in Scotland's referendum in 2014.