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Benzalkonium Chloride Algaecide - available from Amazon, Kills and prevents return. Dilute 1/50 and scrub your path. I did mine last winter and its still completely clear of algae/moss. 1 Litre should last me a few years at £15. Buy 5 litres and you can leave the rest in your will...

If you push then I presume your critic has offered to hold that snow shovel for you to sweep the leaves into?

Type 1 isn't expensive and you'll be glad you spent the few extra quid when you see it (or sharp sand if you prefer) disappear into the gaps instead of your mortar. Assuming your base is prepared properly and your mortar is good, then no you wont need a membrane. Be sure to show us the finished...

Sorry-no idea how I managed to repeat your post in my response!

I did something similar years ago and was advised to dig out any top soil and organic matter down to a hard base. Stone will be ok as long as you aren’t left with void space between pieces for your mortar to disappear into. Compact your stone and fill with type 1 or some other appropriate fines...

So if its level what does the water do - move somehow or stay put?

But it still sounds like a home-made soakaway - put the crate in your hole

A length of field drain pipe within the trench (surrounded by pea gravel and membrane) would give it greater capacity to absorb the drained water to then gradually soak away naturally.

A spirit level sitting on a long piece of timber. Prop one end of the timber on something an inch or two high and you have your gradient

Sorry - it’s a common name used for an inexpensive aggregate used as a stable base. Also called MOT (how these names arose I have no idea) it has a mix of gravel down to dust that once compacted will also allow drainage. Around £35/ton bag last time I bought it

Use sharp sand not building sand, though such will drop through the gravel - maybe just use type 1 mix and compact it as best you can - that’ll provide a decent base for slabs

Probably, but there are products for just such a problem that would likely do a better job (for longer). Lots of manufacturers and information on the net, but something like this...

Looks well built and solid - nice work. I hope I've understood your issue correctly, but from your photo the gazebo looks to be pretty well protected by trees on three sides, and maximum exposure to rainfall is from the front. Even if you increased your overhang by a foot or two (which can start...

If he's suggesting going to the lengths of turning it all over, why not just mix in sharp sand to the existing soil to improve drainage, then the topsoil? The head greenkeeper at a golf course on very clayey(?) land advised herringbone drainage was first prize, but failing that, tons of sharp sand

I replaced my rotten felt roof with new ply and rubber/EPDM last year. Wasn't difficult and looks like it'll last forever

Another vote here for type 1. Also you need your slab base to NOT be completely level - it needs to have a fall of 1 in 40 to ensure rainwater run-off - ideally from the centre of the base downwards towards each edge. I spent ages ensuring my base was level and ended up with a rotten shed base...

You might have moved house again by now, but for what its worth I don't think you'll successfully get any sort of paint to stay long term on a damp wall... Drilling some drainage weep holes through the wall every couple of feet might aid drainage and enable the wall to dry in the medium term...

Looks like you already have battens under the roof edge, so snugly fold the felt around it and nail from the inside edge (ideally if space allows) or underneath. Not ideal to leave a large flap hanging as the wind might end up causing the felt to rip around the nails.

Painting the fence is one of those tasks I detest, so I'm happy to pay extra for the best treatment if it means delaying the next application by another year or two. Worth every penny!

Might be best to saw the rotted posts at ground level (leaving the old concrete) then start your new fence with a half-length panel and place the new fence posts mid-way between the old ones.