Tvheadend

Hi,

I am currently running the latest build on my ubuntu 12.04 desktop system. I use xbmc on my machine in my office but in the living room I use Plex on my tv to watch my recorded shows. I have noticed that some shows, mainly on channel 4 here in the UK are recognised by Plex and it automatically tags it with the correct series data and shows it under series and episode. However, I have been unable to work out why it only does it for a couple of shows and not the rest. I am using the freeview, eit and free sat over the air grabbers.

My question really is, is there anyway to set tvheadend up so that it will automatically add all of the season and episode data to the file so that plex recognises it and displays it correctly?