saveasteading

That to me is decent justification. A kit reduces risk for the beginner, just don't try to change anything from a proven form. It depends on more than that though. Geometry, the ground and topography, how it links to the existing...and more.

Tell more?

On reflection I'm not thinking to add redundancy thtough extra piping, but to avoid petty savings. Eg does the utility room need any ufh? Miss it out, or half of it and save £30? Space the pipes further apart in some rooms? Likewise. There are places to save hundreds or thousands or tens of thousands and this isn't one of them.

Measured by bucket or bag, not by shovel until you have a total feel for how much a shovel holds. If you shovel the mix to different spots there is less brushing. It's not hitech but very important so that blocks are locked really solidly.

with a fan drawing air from the adjacent areas every time it is used.

I agree with @ProDave that bolts are advisable, not expensive either. But it might be tricky to drill unless you have a 90° drill. ring shanked nails or fully threaded screws at 150 cc, staggered.

I'm no expert but we are having a big area designed at present. There are additional pumps at manifolds.

You should have lots of fixings. The whole floor load, where raised, is resting on the fixings.

On top of what? Can you recall the price level?

I was tempted by a pruning chainsaw at the local market. Incl 2 batteries £30. But my sensible self decided it would be poor, maybe dangerous.

With experience now of the steading stove. Externally fed air makes for extremely efficient combustion with even a single log glowing brightly. The tiny amount of ash confirms the efficiency too. So it doesn't have to be a huge blaze with multiple logs as in old draughty burning boxes. Is it justifiable? The steading is rentable and gorgeous, so it's a big plus. Although it is highly insulated the heat isn't excessive and is controllable Plus it's a backup in case of power outage.

Client didn't want or need it, or want the cost.... I'm guessing it's about £40/m2 extra. And like, presumably. Try spilling some red wine on that. I've nerdily done that on tiles we are currently looking at.

I've posted a real floor after 15 + years as a separate post. Dryshake I've used once. It makes the surface harder and can add colour, but it still crazes. If a domestic client wanted a concrete look I'd recommend large porcelain with that effect ( very realistic, as concrete tiles really could be made crack free). £50/m2. Resin does not, of course, look like concrete. If budget is of interest, you don't need concrete over concrete at all.

This was a project of mine about 15 years ago, maybe more. It is used by a company you all know. I was there recently as a customer and asked if I could look at the warehouse for interest. I'm really pleased how this is performing after the years of forklift use. No cracks other than the controlled joint which has barely widened. But look closely at the micro cracking of the surface. This is normal and is always there unless covered by paint... and then it isn't exposed concrete. This is why I don't recommend concrete in a house unless desperate to impress on Grand Designs ( who won't return to see it with stains and cracks years later.) And this is a very good floor by utter experts. Bte the few tiny indents are caused by lignite which we get in aggregate.

So a very heavy warehouse for forklifts and racking? You can do almost anything over that. Your internal walls and even steel columns could go straight on your floor with SE input. Above that I would have minimum 150 pir then a screed with ufh. As prev discussed I don't see the attraction of a polished slab in a house, perhaps because I've built hundreds and see them as functional. I'll find a photo to emphasise this.