Or the base on one side settled, throwing too much weight to the right hand side.
Maybe there is a big hole there that we can’t see. 
The hole theory might just go with the workmans tent on the opposite pavement 
If you look where the offside front wheel is it does look like the setts have sunk a bit.
Anyway glad it didn’t happen recently 'cos I usually have a coffee outside the cafe at the bottom of those stairs when I’m in Durham!
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