Frankly, these people operate with a perpetual optimistic bias, but in this case a little bit of optimism my be in order if they let the market work (which is one enormous IF).  There are quite a few independent producers building positions in the north sea.  Their objective is to do to the North Sea what has been done to the Gulf of Mexico.  It is possible, actually probable, that they will be successful if the governments stay out of their way and allow them to run their business.  We will see.  Whether they can arrest the decline will have to be seen, but they certainly can slow it.
One of the things the UK governement has done is to add 10% to corporation tax payable by North Sea operators - twice - that's 20% additional tax - not much of an incentive?