Ok! Great news. Thanks to
@dmc I have a new flywheel on the way. Dished LH2.4 flywheel was ordered from Skandix:
http://www.skandix.de/en/spare-parts/engine/engine-repair/crankshaft/flywheel/1002822/
I've also ordered the pressure plate>>Sachs 3082 204 033 for the dished flywheel. Also know under P/N 1209874
https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F352234429717
The clutch used needs to meet the following specs:
Teeth: 24
Hub profile: 18.30x20.4 24N
Diameter: 228mm
I have been advised that the Vauxhall Astra gte 2l 16v use a Clutch disc which meets my requirements. Specifically one which uses the F20 transmission, which I believe were made between 1988-1991.
They are hard to find....thankfully, Ride_on from 300mania has helped me out with some info and told me that Helix Autosport do clutch kits for the Vauxhall Astra, so I gave them a call.
70-4627 organic plate £136.55
76-4627 (5) Paddle plate £166.23
They also said they could do a 6 paddle plate clutch. I went with the organic clutch as it should be fine for my application. I think the above pressure plate and organic clutch will be good for about 400nm which is likely well beyond what I will be producing.
Clutch thickness is 7.6mm which apparently works fine. Any thicker and you require the use if shims between the flywheel and pressure plate...which may require some grinding of the inside of the bellhousing to accommodate.
I hope this helps somebody one day...