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With a lintel the steel is tensioned before the concrete is placed and only released when the concrete is strong enough to grip it. The concrete then experiences compressive stresses to balance the tension in the steel. Put the lintel into bending and the bottom face normally goes into...

That shows how deceptive single pictures can be. If your pole went in that easy then the ground is really soft and it's not likely you'll be able to do much on the cheap with any hope of it lasting. It might be worth lifting a couple more slabs and maybe digging a hole to see whats actually...

Why do you suppose they are called prestressed concrete lintels, Woody?

That looks like full bed mortar with some fine roots having found their way between it and the slabs. (Good start) You'll need to dig down a bit to see what's below but if it's solid then it doesn't really matter,

PW only kicks in if you are digging founds within 3m of neighbours foundations (not the boundary) AND going deeper than theirs. I always got a PWN agreed if we were within 3m irrespective as it's simpler and safer that way.

Tne 2022 changes mean LABC guidance is now (ideally) 150+150. It was 100+170 hence the availability of a slightly strange thickness

Dependant on your soil and presence of trees you could be looking at >>700 if following NHBC guidance. <30sqm you don't need BR but you do need fire resistant construction. I wouldn't chance 100mm slab if t'was mine.

Normal PSC lintels are straight but on a larger scale prestressed beams are often percambered to improve their performance. The reinforcing bars in PSC lintels are straight because they are tensioned before the concrete is placed. It is not uncommon for post tensioned beams to have curved...

I think they would have looked better without the side upstand. Really weird as they've laid a course on edge on the bottom course as if to deliberately make it higher. No City & Guilds award for this one.

If you dig a bit deeper I think you'll the bricks corbel out from the main foundation

Then councils wonder why peeps flytip.

"Active internal strength" there's a new term!

If it's in bags you can the run it to your tip if necessary.

Designing to standard brick format is all well and good, but half decent brickies will get the dims you want.

As above but I'd say go for the fulll length posts and concrete gravel boards for maximum life.

As I can't work up enthusiam to dig out my old laptop to access Superbeam I can't answer accurately but I would guess at a 203 UB which is available in 102 & 133 widths and a variety of weights

No: B##### Baffles Brains

This niumber must vary though: smaller if heavily loaded, bigger if driving fast due to centrifugal forces (ever seen dragster wheels close up?) All very academic.

"The guy made it sound like it, but he would, wouldn't he? I'd have checked them out in more detail if I'd been thinking of giving them an order." Jusr remember the BBB principle.

You really need whoever has specced the beam to finish the job. Would seem rather a beefy beam though.