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Bobbo
The steps are dug out and as you guessed are on a bed of type 1. They are all bolted together with 200mm bolts. They are infilled with more type 1 and will have 3" of shingle over a membrane.
Your best bet for a patio is a concrete base of 3" to 4" with a 1 to 2 degree fall (buy a gradient level about £12). For crazy paving, something I would never do, your best bet is a constant 1" bed of mortar. Joint with a 3:1 sand/cement mix, just wet enough for it to stick together, karate chop in with a trowel edge, point with a gloved finger or short length of hose. This mix won't stick to the slabs if dry enough, simply brush away the excess as it goes off.
I challenge the contention that any apprentice is dumber than some of ours, many would have fallen for the video prank above, some of them 3 times in the same day.
Three blades died in the making of
the steps, they were REALLY dead. Here's the other run.