James, as I have said above, UK2000 scenery does not work properly with P3D 3.3.3. Ground textures/markings are blurred and jetways missing. Apparently due to an old SDK being originally used which is not compatible with the latest P3D update.
It does not matter whether you do a clean install of P3D or you are using W10. Unless a fix is forthcoming these older sceneries, which did not originally have a P3D installer, will NOT work.
I went back to P3D v3.2 and all is fine.