Surely having 2 licenses (UK ATPL and EASA ATPL) is the best option.
Ehh just having ONE is the best option.... Leaving EASA is the stupidest thing proposed by Johnson..
Best advice given on this topic is by Alex who knows his stuff so stop reading the Daily Mail or Sun to get your Brexit advice. You just read it here on Pprune for free by a man who knows what he is talking about instead of reading all the opinions of people who "think" what will, should, could, has to happen.....
It seems that, if you hold a licence now ith the UK as SOLI, then if you take no action this will become a UK only licence at the end of this year. As some say above there is nothing that says that after this year EASA will treat this as anything other than a third party ICAO licence and, if you wanted an EASA licence after that date you would have to retake all the ATPLs and take an ATPL skill test just like an FAA licence holder would. On the other hand, if you transfer your SOLI now to another EASA State your EASA licence will be maintained and the UK CAA say they will then issue you a UK ATPL on an equivalent basis.