You may want to wait out the whole Brexit thing going on, no one really knows how it will effect aviation (or any other industry for that matter). Could turn out that your British passport will no longer give you the right to live within the EU, unless you make it in before March 29th(?) and you are potentially grandfathered in.
Also, how competitive are you for getting on with one of the majors in the US? Do you have all of their requirements including the college degree? What is the reason for your move? QOL/type of lifestyle, or career related? If a QOL based decision then I definitely get it, as I myself moved back to Europe from the US almost five years ago and have no regrets. But, if you are doing it in search of a better career, then I would say you are better of staying on that side of the pond.