Season 6 has only just finished a few weeks ago on Sky One. It won't be anytime soon we get it, as over the past few seasons Sky has willingly allowed it to be later than around the same time as in the US.
Keep an eye on this website, it will update whenever there is any news on an official air date.
I would also recommend signing up to Sky Never Miss, this will send emails to you a week before a show is due to air.
For Blacklist when it was on Sky Living I would have believed you in a "few months later", but for whatever reason Sky are getting lazy with picking up the rights on this show.
Last season it was either finished or practically finished in the States when it finally started.
If it wasn't for Flash/Supergirl/Arrow, FBI, SWAT and SEAL Team I would seriously reconsider my subscription to all of Now TV.