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Yup that'll be fine to screed over.

You'll need to: Uplift old Parquet Blocks Screed subfloor with a self leveller like Ardex NA or F-Ball 1200 Apply Liquid DPM such as Ardex DPC or F-Ball F77 Screed over Liquid DPM with appropriate self levelling screed and primer (if screed requires) Then you'll be able to fit your LVT Go...

How much do you need? Jewsons sell a 5.5mm Flooring Grade ply which will be fine as you are using a finishing coat screed over the top.

Mercardo Wirral are worth a call and see if they will sell direct.

Where abouts in the UK are you?

Most Engineered Herringbone has to be direct stuck and can't be floated on an underlay so you would need a 10mm Screed over the UFH

Renovation over the top should be ok.

If the floor has not moved thus far, it's probably a case of leaving it and see what happens. I'd have expected it to have moved/buckled quite quickly but as it has not, you may get away with it as it's a floated installation. I don't doubt a stuck down installation would have blown within a...

Yup that’s the best thing. Don’t caulk anything. Prime before the final screed coat will be screw specific, check the recommendations but the better screeds possibly won’t need priming.

It’s on the limit of the spec but should be ok, use mapei renovation for the final all over screen coat though.

Too much movement, too many different floor surfaces and it’s never advisable to screed over chipboard.

Unfortunately you’ll risk the SL not having the structural rigidity at that depth. Usually you can bulk with chippings with alot of products ok and that will bind the mix together.

Check the specs of the SL, not all are suitable to go 60mm

You can build the height up with self leveller and bulk it with granite chippings, or, use a cement/mortar. Important thing is this needs to be dry before you final coat screed to level. And when I mean 'dry' it needs to be tested/checked that its 74% RH or below before laying the LVT...

60mm is quite deep, does the porch have a DPC?

Most timber merchants should carry it rather than DIY stores.

You need to level the tongue and groove with 6mm SP101 flooring grade ply, then level the porch to the ply with screed, then screed over the whole area with a suitable self leveling screed, we use Mapei Renovation. Make sure you use the right self levelling screed, most are not suitable over ply.

You can’t float solid wood floors on an underlay, they have to be directly glued to a correctly prepared and perfectly dry/moisture tested subfloor.

slide them on towels or a teacloth.

You can’t fit carpet over the fiberboard panels. Floorboards look normal but would benefit from fitting 6mm Ply before installing carpet etc.