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Cheers
It's actually this stuff: https://www.wickes.co.uk/Wickes-Treated-Sawn-Timber---19mm-x-32mm-x-3m/p/9000036476
I went through your bits, but worried that it would be too top heavy even before an unruly toddler clambers up, then found the spare 20x30mm. Plus it should look more in proportion, whereas some of the Ikea hacks I've seen look a bit chunky up top.
Although it's rough as fuck I sanded a section of one of the better bits down and it came up OK.
I think it used to be a bit more "agricultural". I only found that as I was researching what to build kid friendly garden furniture out of (the off cuts if which I think @hugo7 is talking about). I certainly wouldn't be making any chopping boards or turning any bowls out of it.