After saying how perfectly brilliant the game was earlier in the thread i'm temporarily taking back my comment.
I'm level 59 and finished Mage, Companions, Dark Brotherhood and Thieves Guild quests so i decided to finally finish the main quest line. I had done Diplomatic Immunity earlier but upon looking at my list of quests the next quest hadn't started. I went back to Delphine to see if i just had skipped the conversation but this was a fail. I check online to see what the quest was actually all about and skipped most of it to head to find Esbern, hoping to skip most of the steps of the quest, which again didn't work.
Apparently, this is a really common bug and on a console there's no way of finding a solution apart from loading a previous save from before the completion of Diplomatic Immunity. Being an absolute dick, i had deleted all saves from before the quest and am now fucked so emailed Bethesda to see if there was a solution.
"Hello,
We are sorry to hear that you are experiencing technical difficulties in our game.
I am afrad that at this point in time, all we can advise is to try loading from an earlier save, and trying again. Sometimes, even trying to make different decisions or going different routes can help this problem.
There should be an update released that deals with problems similar to this one, and hopefully the update should clear it up. See here for details:
<a class="postlink" href="http://www.bethblog.com/index.php/2011/12/01/skyrim-what-were-working-on/" onclick="window.open(this.href);return false;">http://www.bethblog.com/index.php/2011/ ... orking-on/</a>
We apologise for any inconvenience, and hope you can enjoy the game as intended.
Kind Regards,
Francesca, Bethesda Technical Support"
NOT IMPRESSED. Starting a new character after i've finished my Uni work this week.