Some additional information
I've been doing a little more research, so I thought I'd add to my story.
Out of curiosity of what replacement parts could be ordered to try and fix the problem, I looked on FastLane. From some of the photos there, I have now decided that the lighter is stuck in the down position, and is never warming up so that it pops up.
What this means is that I am unable to pull it out with pliers. I'm not sure if this means that there's something wrong with the lighter assembly or whatever it's making contact with in the car. I'm also not sure how to "open up" the lighter assembly to examine it, it looks like the casing isn't easily removed.
Any information or suggestions that anyone can add would be great, thanks again
78 280E "Sally" 130k