Do you have some numbers on the salary difference between London and the US? I've often wondered how big it really is.
I'm not sure if this approach is the latest plan because who knows what the plan is?
I'll give examples that I know of from personal experience -
My DH is a mid-level/senior Java platform developer. He'd *easily* be earning $75k USD here in Buffalo, probably more, where a small house in a nice area costs less then $100k USD for the mortgage. I'm pretty sure he's underpaid, but earning about 45k GBP in London, where a tiny flat rental costs significantly more than my mortgage. In NYC his skills would be a 6 figure salary. He's worked with Bulgarians in all of his jobs around London, so that's where the comment came from. My old company had 2/3 of our technology staff in India, working long hours for a fraction of the pay. Super awesome to have them be a "peer" and know you're living a significantly better life.
I have another friend who immigrated to Switzerland. The company wanted to hire him in London, but the "competitive" pay they could offer him was 2/3 of what he was earning in the US - hardly worth uprooting your life for. He's now earning over 200k (I think - it was a generous offer but can't remember exact #'s) in swiss currency for the same company, because while the cost of living is more pay is significantly more competitive there.
For me - I'm a mid-career business intelligence dev (SAS/Cognos/Business Objects) but without a degree/certifications, so I expect around 60k USD. In 5 years I'd anticipate earning 15-20k more in Buffalo, it'd be more in bigger cities. All the jobs I've found posted with a salary are in the 30-40k GBP range, occasionally 50. It's definitely closer with BI than straight programming, possibly because there's a bigger need to understand the data you're working with and communicate the findings, but to me it's not relative to cost of living *at all*.
So - with the current exchange rate, and the challenges that seem to happen with finding a UK employer and this crazy declaration of foreign workers on the horizon, if I can find a remote job I'll be a lot more secure. The news of this week has honestly caused me panic attacks because I was starting to be frightened of the move with Brexit, now it seems like they want a noose around the neck of foreigners who have every right to be in the country and working.