When I went into Blackreach I made the horrible mistake of picking up a crimson nirnroot and therefore starting the collect quest,

after spending an hour or so and collecting 24 out of the 30 required to complete the quest I got myself into a fight with a resident falmer,

As he was using a bow from his hut I ran inside and then proceeded to remove his head from his body only to find that I was now trapped inside his hut!

Try as I might, there was no way to get out! I tried sprinting at the door, ducking down to try and squeeze through, Whirlwind speed Chant

I even took all of my armour off hoping that my reduced bulk would let me get through!

After 10-15 mins of trying I finally gave up and reverted back to an old save where I had only just started the quest