One Trick Pony is not the kindest-to-self way to look at it CashmereMafia You mean, you're good at your job in your existing sector
So, whilst you could go to college, train to be an astronaut, set up a cake-baking business etc one argument says it's sensible to stick around in the area you know and are already successful in.
Back office is one good idea. Another idea is joining the Freelance/Self-Employed thread on here - ie becoming an independent consultant. In order to (really) bring the bucks in doing this you have to have (a) an acknowledged expertise in your field already (which it sounds like you do) and (b) some contacts who''ll give you work to get you started (then you can branch out from there).
It's a bit of a learning curve - you have to be able (or not afraid to) sell yourself for a start, work out how to manage projects, how to charge, how to deliver them on time and so on ...
,,,but first of all you have to work out what skill or knowledge you have that you can sell, who you'd sell it to/who would buy it and how fast you can complete.
I don't know much about banking etc but I imagine there are lots of little specialisms (or deals?) that require extra work to be done that there are not enough full-time staff to cover?
As for potential customers. If you are in UAE you could start by thinking quite big about this IMO. Potential customers:
British firms in UAE
British firms in UK who want to trade either with UAE or other Gulf businesses or British firms
UAE firms who want help doing business with the Brits
I say 'firms' not banks as there may be an interchange there as well - firms may need help dealing with big banks.
Once you've done one successful project you can start putting yourself about whilst chatting at some of those Friday brunches/Jumeirah BBQs etc.
I could go on ... but I am a bit of a bore on this subject. Anyway hope this helps
Find the back of an envelope and start sketching out your plan now - you'll be raring to try it out before 6 months is up
MrsBaldwin