What is regulation re siting gas cooker near opening window?

[RRRRRR]

The question's in the subject title really.

Putting gas range against new stud wall in converted garage at right angles to original opening window. I've searched and read loads, and 300mm seems to be recommended.....or should that be 'regulated'..... but then it doesn't seem to matter according to others. Common sense suggests a minimum distance, but can't seem to get to the truth.

Is there a gas cooker link for all the gas-safe rules? Can't find that either!

Thanks.

 

[merlin50]

this should be done by a gas-safe plumber

 

[RRRRRR]

.......OK.