Almost all types of gundog! That's the short answer. The longer answer?
Retrievers, you are the retrieving specialists. This is the course you need for blindingly beautiful blinds :)
Spaniels will perform retrieves over a shorter distance than retrievers or HPRs, but the methods and approach are the same. So this course is for you, too.
For HPRs (versatile dogs, bird dogs), if you are in the UK, this is the course for you.
If you have a versatile dog/bird dog/pointing dog and are outside the UK, I would recommend you first research what type of blind retrieve is required. The type of blind retrieve taught on this course, is a straight line blind - where the dog runs out from heel in the direction provided by the handler and keeps running in a straight line until stopped and handled. Some countries or testing systems instead want to see a dog independently hunt up a large area without handling (as in the NAVHDA duck hunt exercise). The course does not cover this type of blind retrieve.