Thanks mate, much appreciated, it gives me a better understanding of how it all fits together.
Poking around with the tape measure shows I only have 50mm tyre to inner arch clearance so mounting coilovers behind the tyre may not be an option, however running 15" wheels does give a good useable space inside the wheel area with which to mount a coilover.
Still more measuring to do though. ..
Rear Coilover Mounts
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Re: Rear Coilover Mounts
https://easywider.co.uk/ universal flexible wheel arch extensions
Re: Rear Coilover Mounts
You should be able to squeeze a damper in there, and a spring in the subframe.