I would assume that if the London base goes ahead (???) then if it enables crew to transfer ( on same terms and conditions) then they may have a few who would like to do it- otherwise they will do the same as other foreign airlines which have crew based in UK and have separate terms and conditions similar to UK cabincrew counterparts. If that is the case and it all goes ahead....they will have no problems recruting for a London base, so long as applicants hold EU passports ( ie. Any UK/Europe citizen could apply).