Oh, it is Erik.
'Fraid I'm not one of these "must reduce exhaust emissions" people - after all that's a pretty small percentage of the overall environmental cost of a motor vehicle.
Me, I'll stick to my Morgans and Land Rovers - infinitely rebuildable (at present!).
I wish I was "infinitely rebuildable", but it seems that finally some bits are worn out and about as easy to repair as a modern car. It is going to be "not nice" and I'll be off driving anything for 6 weeks. Oh Joy.