New UK airgun laws

Here in Oklahoma if it has a trigger and we can pull it, we can own it. 
This shirt pretty much tells the story.
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The airgun law of India is as follows.1. No licence required for air rifle .177 cal and less than 20 joules energy. 

2.One have to get licence for .22 cal air rifle or higher calibre. 
3. All air rifle are put through DEAL WOOD test before retail to ensure energy restrictions are followed.
4. No air rifle is allowed to be carried in public or private transport without a gun case or a cover.

 
"Mayank"The airgun law of India is as follows.1. No licence required for air rifle .177 cal and less than 20 joules energy. 
2.One have to get licence for .22 cal air rifle or higher calibre. 
3. All air rifle are put through DEAL WOOD test before retail to ensure energy restrictions are followed.
4. No air rifle is allowed to be carried in public or private transport without a gun case or a cover.
What is the Deal Wood test?