Some updates - A couple of days ago I got some new tyres:
My new tyres came in. I was recommended the new Hankook Ventus R-s3 (in 245 40 17).
They're chunky, much like the Neova's I had on the Golf GTI. The JDMyard guys had them fitted and balanced on the OEM BBS rims, ready to go.
Even though they're a size down from the 18's I had on the ride over bumps was firmer, must be due to the stiff sidewalls on these tyres. Haven't had a chance to test them out though, will review (properly) ASAP.