@oversea thanks very much for your input! No other extenuating circumstances. I simply married an American, the US is looking like my long term destination, and I do not want to mess with the IRS. Delaying relocating my IB account may not be a big deal, but I still plan to pay US taxes on it come March 2018. Guess there's another option here: not relocating the account, and declaring it to the IRS as a foreign brokerage account.
Got it.
As I was writing the last post, I was wondering what you were going to do re taxes.
Something to have in mind...presuming that you don't spend 183 days in the US this year, you won't have to pay US taxes for 2017 tax year. Subsequently, that means you wouldn't have to worry about the IRS until March/April 2019. Before undergoing any of the rather significant changes listed above, I would hold out for the next few months and get an indication of how serious they were about repealing Dodd-Frank (and which parts!).
If you're indeed dead set on doing one of options 2-6 from the outset...with regards to option #5, why bother with BVI? I imagine it would be both easier and considerably cheaper to setup everything in the UK while you're still there --- Companies House, Bank Account(s), migrating IB, etc. And also...moving forward, you won't have that 'eyesore' of a shady jurisdiction on your tax return and FBAR! You'll also find out, that US banks get really uptight when you're wiring money back-forth these places as well.