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Here it is. And the wall thickness is approx 270mm at the bricks (excl any sills, cement ledge etc)

No idea is the answer to most of @bobasd 's questions unfortunately. I simply don't have any more information other than the D&T survey plan in regards to the works done. On the plus side there is no longer any visible or touch damp on walls internally or externally whatsoever. On the minus side...

Thanks, very helpful response. As I said it was a previous owner that did the 2010 damp proofing... here is all I have, hopefully all should be clear from my previous photos.

Well here is the update; 1) I'm not convinced the clay gulley is refilling itself from a crack after all. I think it may have rained a little overnight previously. 2) I conducted an amateur drain survey... refer to my very professional drawings below Key: Blue= Rainwater downpipes from roof...

OK @JohnD, my theory right now is looking like there is a leak or leaks somewhere that have been going on for over a decade. This caused damp issue pre-2010 whereby in 2010 the previous owner got Kenwood In to do a bunch of, presumably expensive, damp proofing works including the cement plinth...

Well the plot thickens, or rather the water deepens. After having removed all Standing water from the main rainwater gulley drain yesterday afternoon, this morning the drain had about 12cm of water in it. I don’t think it rained overnight here, and my other rainwater gulley drain didn’t have...

Well that was the old double-brick extension, that wall was subsequently demolished, which was not part of the original Victorian so not sure it would be the same level or type of DPC as the main building.

I had wondered this, the new build extension as you see it is actually a full replacement (all walls demolished) and extension of a smaller 20th century extension that was there previously (which was on its own, smaller concrete floor, so probably late 20th century). The builders are imo fairly...

Correct DPC is at ground level between brand new engineered bricks and the London yellow stocks. New build extension is slab base and floor is about 150mm above ground level as pictured, ground level bricks (that sit on DPC) are typically very dry just wet in pic due to hose usage for hole...

Not sure where you mean, if you're referring to around the air bricks/grates then the cement always is sealed to the air brick/grate so no chance to see the slate DPC. Would my SDS Hammer Drill work to take off a section? I've got plenty of air bricks/grates on all 3 sides of the end of...

Well I don't doubt your bet is looking good and intend to see this thing through to fruition... I'll have a read of all of those links later. Fortunately I have a Wet & Dry Vac so was able to remove all standing water from both drains - Photo E below shows the one on the far right of Photo A...

Looks intact, standing water about 50cm below ground level.

Yes and the soil was very moist... it is located some distance from the drain in the middle of Photo A above, just to the left of the new PVC door of the new extension under the white cabin hook. No worms. There is not much use in it drying out as I'd imagine it would be similarly damp all the...

Image dump Photo A - the full end terrace, new extension & guttering on right, original Victorian finishing at bay window on left Photo B - the property's main external drainage area. Main gutter down pipes on right, Cast Iron SVP in middle, and Plastic down pipe on left Photo C - the...

The paving is just rubbish crazy paving laid straight on clay soil and as such has no drainage other than natural. As you can see on the left of the image in the OP, the cement plinth is extended to cover the ground area left of the bay and the main down pipe runs into a ground drain next to the...

The dig-down attempt below plinth

Via the large sash window which is frequently opened or left on the screwed in window lock posts. Good idea, let me do that. There is no area without the plinth (other than our new extension) so I will have to dig or remove the plinth to see. No, only mains feed so no ability to check for...

This was done in 2010 by the prior owner. Is there anyway to reverse this or remediate? The wall that was tanked belongs to the pictured room and has the biggest humidity issues in the house... Thanks for the suggestion, other than 2 large sash bay windows all other windows in our property are...

I'm not certain but as the walls are about 300mm thick or more my assumption is cavity Yes suspended timber floorboards, not insulated to my knowledge Hmm fair point, I read that cement plinths can cause humidity, this link has a replacement with a Natural Hydraulic Lime (NHL) as a base with...

Hmm... you seem to have your mind made up. The below Temperature (blue) and Humidity (purple) chart is for the room. Windows open the humidity drops to the outside ambient 55% RH level... however you can see how steeply the humidity spikes back up when the window is closed again - this is with...