For the energy sector? The US (Texas) and the UK (Scotland) typically would be the best options. However, as you probably know, visas can be tricky in those countries, the US most of all because of its lottery system.

That's not to say that if you did your MBA at Strathclyde for instance, you'd be shut out for visas/jobs - in fact, many students make this transition by using the Strath MBA in just this way.

Language may also be an issue, since if you wanted to go to some countries where energy is big business (Germany, for example) you'd need so speak the national language. Not sure what your language skills are.

Full-tuition scholarships are going to be extraordinarily hard in any case, since you have a similar background to many other MBA candidates...