This has nothing to do with politics (although I agree that business environment in Canada now is extremely negative). 

It has to do with the fact that After Shell took over BG (with their usual philosophy to guy high and sell low), they have to deakl with their debt, and there has to be some logical consolidation. Bothe BG and Shell had massive projects proposed on the West Coast.It would make sense that Shell wuld go ahead with the more logical option first (although at a much slower pace, because of the global glut and because of politics and extrem environtism in Canada).

It should also be noted that Shell is the worlds most expensive producer out there. CAPEX and operating costs much higher than average, due to bureaucracy and consistently bad management decisions.

I have worked for both Shell and BG-for several years in both cases-