Your format is way off, try using some free software like trelby or Celtix.
You had no slugs.
INT. is not a slug and it comes after Fade in not before.
INT. LONDON UNDERPASS - DAY is an example
The opening description/action is 3 lines too long and it tells me nothing about the main characters Carl and Donny.
Read a lot of scripts on here and participate and it will pay off.
If you have any questions you can pm me