Like ive told you on msn mate, its an auto choke, when fitting it to your mk2 you will just had to bridge the old auto choke water hoses, i think the new carb may need a live feed, (the mk1 recieves it from the alternator) i think, just fit it and see mate, my old crossflow never needed a choke to start it up, even in the coldest weathers.
HTH