This is pretty normal, my LCR sounded like a diesel on start up. I believe it's a function of the hydraulic tappets and the time it takes for the oil pressure to get upto normal operating level at the top of the engine.
 
cheers guys, i didnt think it was a problem. Just thought it was pretty kack thats all.

Im used to the start up of an RX-8 which was ALOT quiter!
 
lol..yea mine does to. I was wondering about this..but then realised..its just how it is. Might be something to do with small engined turbo cars...as my car..my mates focus rs..and my mates astra vxr all sound like deisels on start up.