How can I remove orphaned checkout pages on my website?

[neatproductsltd]

Hi - i've identified orphaned checkout/order pages and i have no idea how i am supposed to remove them

Here is an example link 

https://www.toughtools.co.uk/70657343793/orders/e04bbbfb1d349520917fd42d178215d3

There are over 267 of them