when trying to get Esbern to answer the door nothing happens, just wondering am i missing something or is this a glitch? any help much appreciated

Yep. Main Quest glitch. Hope it will be fixed soon. In the meantime do some other things, like join some guilds.

Hopefully you both got it working already. I'll describe what I did a few hours ago when I ran into the bug where there is no sound from Esbern and the door won't open. I found my solution in the first post in this thread:
http://www.minecraftforum.net/topic/786124-skyrim-a-cornered-rat-bug-fix/

I downloaded the file linked in the forum post, unrared it, logged in to my administrator account (Win 7 - 64-bit) and copied the file (BSAUnpack.exe) to my Skyrim data directory. I then ran BSAUnpack.exe, selected Voicesixtra.bsa, and then clicked on the "extract all" button. I then got a dialog box that prompted me to enter the directory to extract the files to so I selected the Skyrim data directory. The program seemed to work but no files were actually extracted.

I figured the files couldn't be written due to a Win 7 file permission issue so I ran the program again and extracted the files to temp directory that I created on another drive. I suspect you could extract them to your desktop as well. I then copied the "sound" directory to the Skyrim data directory. I started up Skyrim at my last save that I made just before trying to open Esbern's door and the game ran properly - I could hear him, he opened the door after a conversation through the door, and the quest continued properly.

I hope this approach works for you both until a proper fix is provided.