What does it smell of? Petrol? If so, maybe theres more choke on than it actually needs. Usually I draw the choke out on mine while turning it over until it fires up, then gently push it back in until I get a reasonably steady tickover. This position is typically less than half way out, and within a few minutes it can go all the way back in, even in winter. In fact in summer it will start without choke, I will pull it out a little just a fraction to smooth the tickover for the first minute or two. Remember these cars are designed to start in -40c Swedish winters, so the cold start is largely redundant in mild UK weather conditions! On the subject of catalytic converters, have you ever smelt the exhaust of a car with a hot cat?! (rotten eggs) And don't forget they don't even start working until they are thoroughly hot, which means on most cars they don't actually do anything because they never get hot enough. Don't get me started on the lies of the new car industry! All the best Rich