I finally bought a set of 19" wheels. 8.5X19 ET 42 with 245/35/19 tyres. look much nicer than the std 17". No clearance issues, and although I've only driven about 5 miles the ride comfort felt fine.
I've been in touch with someone from Chester area who was selling their type s just before Xmas, he's had his remapped up to 235 bhp by Celtic tuning and apparently he hasn't had any issues at all. P.s. he didn't sell it and pulled it off eBay after 2 days because he said it's such a nice car...