It's possibly just a sample that Martin Perry has received through the post before giving the go ahead.
I did something similiar when I had my carpet fitted.
Typical amateurs.
Instead of handcrafting an arch they are quite obviously stealing someone else's bit by bit.
Spraying it with with a can of white car paint from Halfords ain't fooling no-one.
Expect a major bridge to collapse in then next few weeks.