Straight Up

After work this evening one of the men had arranged for most of us to go for a meal in Henley-in-Arden (I say "most" because some couldn't make it).
We had an excellent meal, but I had no chance to take any photos.
I was walking back to my car, which was parked in the High Street, and noticed this interesting building opposite to where I had parked.
The beams on the left hand side (facing it) are really sloping at an angle compared with those on the right. I wonder if it was built like that, or whether there has been a bit of land slippage on one side in the last 500 odd years since it was built?