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According to Floplast ' "There is no maximum gradient; a fall of 1:10 is usually considered as a maximum guideline. BS8301 states “Research has shown that high velocities of sewage flow arising from steep gradients do not cause increase erosion of pipes or deposition of solids.” '...

Increased radiator sizes may require larger pipework. Survey and calculation required.

3-part plastic high-level flush pipes are still made for retrofit, cut and trim as required e.g. https://www.cityplumbing.co.uk/p/wirquin-macdee-high-level-flush-pipe-3-piece-white-side-wall-dfp12wh/p/931543?srsltid=AfmBOorr2PvEmTzkYzUJsPmyP1sjq3r6iFdlqhySgI9-n-YswhgHJY-f

First impressions very likely correct...

21mm approx OD black alkathene will be 1/2" imperial nominal internal bore . Roughly equivalent to15mm copper and 20mm OD modern blue poly.

The twyford classic pan is available in both horizontal outlet and S-trap versions. Can be used with both high and low level cisterns.

£600 to not fix the problem?? Ahem.. Clean and degrease mating surfaces and apply CT1 or similar to glue the speedfit elbow into the soil pipe. Secure with cable ties, daisy-chained to achieve length. Allow, if possible, overnight to set. Won't make the unvented install correct but should...

This is almost certainly a generic euro unvented product imported without UK type approval/certification. Cheap for a reason. With the correct safety inlet group and appropriate expansion vessel (and safety discharge pipework) hard-piped in it probably could be made to work safely, if...

or https://www.screwfix.com/p/rothenberger-monoblock-tap-spanner-set-3-pieces/40102

http://www.klar-environment.com/pdf/PD0094-24BA-BB_Installation_Guidelines.pdf page 10 might be of use Disclaimer: I'd talking to klargester technical help before taking this on (or employing a pro)

Check expansion vessel pre-charge and check for water stains below the discharge end of the pressure relief pipe.

Shotgun! Yeah, neighbours, legality, blah..

We talking the boiler flue on the pitched roof or the terminal on the masonry chimmney? It would take a stork's nest worth of twigs to adversely affect safe operation of the former.

if you have cisterns in your loft i'd check the ballvalves shut off fully

Going bespoke like this is a tad risky in terms of future maintainance. It would be wise to hamster a few fittings and some pipe in case someone in ten or twenty years puts a nail through a pipe - no emergency plumber is likely to have the right gear on his van!

Photos would be helpful.

Manufacturers (and sellers) differ on this. Email a sketch to your supplier (plan view, from above) to eliminate uncertainty before ordering.

This, for example, claims to be fully free-standing https://www.edensteamshowers.co.uk/product/larvik-quadrant

your pic shows correct orientation

Can't tell from the photo if it's a PZ2, PZ3, PH2, or PH3 head but using the correct screwdriver will vastly increase your chances!