Colonel Dorcha Lee (Retd) is a former Irish Defence Forces provost marshal and director of military police

JUST before Scotland’s independence referendum in 2014, the Yes vote briefly reached 50% in opinion polls and for several weeks it seemed really possible that Scotland was about to leave the UK.

The seismic shock this must have caused in Whitehall, can only be imagined. With one-third of its landmass and half of its territorial seas, the UK’s strategic defence policy was on the brink of redundancy.

During the latter stages of the referendum campaign, a distinguished former UK General was quietly touring the back rooms of Scotland drumming up support for a No vote. At one location, surrounded by sombre-suited former military, he was asked by a TV reporter about a plan B for strategic defence in the event of Scottish independence. He paused briefly as the camera zoomed in on his well-worn, well-known face. Avoiding any discussion, he answered, “There is no plan B” and moved along.

By now you can be sure there are many contingency plans to deal with what can only be regarded by UK military planners as an apocalyptic outcome.

Suddenly, however, the shape of a possible solution may have been, inadvertently, revealed in Stuart Crawford and Richard Marsh’s, recently released, short paper. Entitled “Could an independent Scotland be defended Scot-Free?”, the latest contribution has re-ignited the defence debate. Back in 2012, Crawford and Marsh produced the seminal paper A’ The Blue Bonnets on how iScotland’s national defence could be organised and followed up with an update in 2018.

The main proposal in the 2020 paper was to lease back bases in iScotland to the rUK, including the Faslane/Coulport base, where the UK’s nuclear deterrent is based, the RAF bases in Lossiemouth and Kinloss, plus additional facilities.

The savings effected could be used to offset the costs of running Scotland’s defence.

Their proposal is feasible. Moreover, an additional factor can be introduced which might help their case. Given international precedent (ie Czech Republic and Slovakia) Scotland should be legally entitled to perhaps 9% of UK’s military assets, including 9% of its nuclear deterrent.

The National: Artful, Britain's latest nuclear-powered submarine arrives at its new home on the Clyde in Scotland. PRESS ASSOCIATION Photo. Picture date: Wednesday August 19, 2015. The 7,400-tonne attack submarine, was received during a ceremony at the Faslane naval ba

READ MORE: Ian Blackford tells SNP conference: Indy is coming and nuclear weapons are going

If it were to insist on the latter, iScotland could theoretically have a veto on the operational use of this deterrent. However, Scottish independists are against nuclear weapons so that is unlikely to arise. But it could feature in the transition negotiations.

The Crawford/Marsh proposal predictably got negative reaction from the Campaign for Nuclear Disarmament and others. Their selective reaction to the temporary presence of nuclear weapons, for a few more decades, shows they have little idea which way things are trending internationally.

Nuclear disarmament will ultimately take place and Scottish independence supporters should think long past that point.

The external defence of rUK bases in iScotland would have to be undertaken by iScotland. But the overall idea of larger countries having bases, in former “colonies”, is well established. It provides income for the newly emergent states and enhances security all round. The sovereign base areas in Cyprus are a good example. The French have many bases in Francophonie and the US worldwide.

The big drawback is that, if the UK goes to war, which it is prone to do quite frequently, iScotland would be drawn in. These same bases would be legitimate targets for enemy attack, including possible nuclear strikes.

HISTORY reminds us, that, thanks to then prime minister Neville Chamberlain, Ireland escaped the Second World War because the UK handed back its Irish Treaty ports in 1938. If both countries are in Nato, however, the problem should not arise.

On the sovereignty issue there should be no particular problem with the Crawford/Marsh proposal. MOUs can be drawn up to sort out acceptable co-existence arrangements. However, on national defence, things are not quite so straightforward.

If we consider, first, that a nation’s operational area extends over its territorial lands and seas, we know that neighbouring countries are in each other’s area of “operational interest”. For example, Ireland is in the UK’s area of operational interest. Unconfirmed reports in the Irish media have stated that the Irish Government made secret arrangements for the RAF to shoot down possible hijacked aircraft over Irish territory, not to mention possible Russian Backfire Bombers, flying with their transponders switched off, in Irish-controlled air space. This is something the UK Defence Journal covered here.

But because of the absence of Irish air defence, in my opinion, the UK has the self-defence right to protect itself against potential air threats to the UK that emanates from Ireland, and, if necessary, over Ireland itself.

Nevertheless, Scotland should not use the Irish model to evade its own air defence responsibilities.

But the good news for the rUK is that the leasing option would allow for a continuation of rUK’s assets to remain in place, and a large part of its current defence strategy to remain intact, for a defined period.

As both the rUK and iScotland will have a mutual interest in air and maritime defence to Scotland’s north, it should be possible to share defence operations for mutual benefit. After all, Belgium and the Netherlands alternate air defence patrols over each-others sovereign territory. Nato could facilitate this, but a defence treaty between rUK and iScotland, would be a better way to tie up arrangements.

To quote an old Irish proverb: we all live in each other’s shadow.

This article originally appeared in the UK Defence Journal.