If both were new applications with identical commutes and packages, then without a doubt I'd take the energy job. There are exciting times ahead in the industry, whereas all my current company does is buy zombie funds and run them off into oblivion. But then, it's just a job. 
Cheers all. Some real food for thought in here. To clarify some of the main queries:
- The new place would be 28 days holiday vs the current 26.
- I did tell the new place (through the agency) that I'd had a counter offer. The new place didn't budge, hopefully no hard feelings on their part 

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- Staying for the bonus then looking again would be ideal, but this sort of company / opportunity will not come up that often and I'll never work for them if I turn them down now. I could ask to defer my application until the bonus comes in but I'd be staggered if they even entertained such a big delay in getting someone into the position.
- Scrutinize - it had crossed my mind that I could end up being the victim in the promised restructure, but I know why they're doing it and it's because there are several weak team members they want rid of. I'd be in very little danger in my position and I believe it would be an opportunity for me. 
- BigT - yes, I agree that's what it boils down to eventually. The reality is that energy interests me a great deal, but then I might just be staring at spreadsheets all day (though I doubt it), in which case how much does the industry really help? At my age, I'll be pigeon-holed as a financial services guy for the rest of my career if I don't make a move soon. Not saying that would be a bad thing... 
One option I'm considering is to leave, then go back cap in hand when they have the restructure, if I can't stand the new place for whatever reason.