Update to help someone else in the future.
I finally had my garage do an in-depth investigation in to my suspension 'thunk' and it turned out that a new air suspension strut that was fitted last year was faulty: when they took it off (which is a massive job BTW) there was something loose inside. Luckily it was under warranty and even better the manufacturer was happy to accept the warranty claim via a video of the strut making a noise rather than having to ship it to Germany for inspection. New part now fitted and the thunk gone!
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