Well I'm home and the alloys do look sweeet!
They are mint in condition with no marks or scratches - I was like a hawk in the garage before they swapped them over - I'll be removing them in the next week or so and giving them a deep clean before I seal them with some gtechniq C5 which will mean they will stay clean so much more easily.
On the journey home (city / Motorway / Country Roads) I didn't notice any degradation in ride quality despite these being 18s rather than the 17 Seattles - perhaps its because these have more rubber on them compared to the ones I swapped

If anything I (imagined) an improvement

I managed to grab a quick shot (well it's a 30 sec exposure!) excuse the dirty car etc. Will take a better shot in the near future