When I order my plugs I look for the suffix number 4339.
This is sometimes called a stock number or type number, but basically you are looking for that 4 digit number
That should get you detachable nipples..
Not actually sure if the number is the same for all the NGK plug grades, it definitely works for my DCPR8E. If not you'll have to just ask the supplier.
Halfords always used to have a little chart listing all the equivalents on the spark plug shelf.. Do they still have Halfords?