Front of Liverpool Cathedral

Having taken six photos of and around the Anglican Cathedral when I checked them at home I found either grey or black in the corners of every photo.
What had happened well I was using the lens at its widest 18mm in this case but never having done this before or rather only when the lens hood was off for macro subjects I didn't realise what would happen.
I did take a quick look at the pics in camera but it was both very hot and sunny so didn't check properly.
Note to self always remove lens hood when using the wide angle lens!!!
So the only reasonable Blip is what you see and that has been reduced otherwise you would have seen the full length from steps to top of the building.
What with the traffic and heat it will be a while before I have another 'shot'.
A Very disappointed penny..