UK Building regulations on 6 by 4 meter single storey extension

I need a UK building regulations for a single storey extension which is 6M by 4M.

I will release the payment once the building inspector has said that the drawing is fine.

I have attached the current file and it would need work to be done on the new extension only. I have attached the previous building regulations but it does not include the 6X4M which needs to be done.

I will send the person who is doing this with the DWG file.

Here is the google maps location
https://www.google.com/maps/@51.5206578,-0.508137,3a,75y,27.68h,76.34t/data=!3m6!1e1!3m4!1sxSpth39o8-1Gjs84mVJaCw!2e0!7i16384!8i8192?entry=ttu