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My advice always begins and ends with 4" of concrete under a patio. By the time you add mortar and surface material that will be about 6" deep and going precisely nowhere.
Many 'professionals' will suggest compacted type 1, this is because it is easier and gives a better profit margin. They will tell you that it is going in 6" deep (which is the minimum needed on anything other than completely solid ground), in reality you will be lucky to get 2". The consequence is that the whole lot will move and crack, but they'll be gone and operating under a new company name by then.
If you do want to use roadstone, dig out a minimum of 8" below finished level (as opposed to 6" for concrete) and remember to compact with a Wacka plate every 2" of depth. If the soil isn't solid at 8", keep digging until it is!
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ColinTheBald
@Polygon
@ColinTheBald, or indeed anyone else with knowledge on the subject, I want to put a round patio in a square garden, or at least not a dead square edge so no edge restraint as such. The whole area is already dug out to the bottom of the subbase level. Will MOT type 1 hold its shape if built up and compacted in the middle of the area, or do I need to backfill the edges to the same level at the point of compacting?
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