We have a very junior captain; in fact it was his first flight after released who did not comply with the speed restrictions imposed by ATC on short final ( eg 160kt until 5 miles) and took too long to vacate the runway causing a 747 to go around. Obviously ATC reported the case and we got an email from our chief pilot to remind us to comply with ATC speed restrictions. It always amazed me when pilots fly so slow, fully configured by 2000 feet and blatantly disregard the speed imposed by ATC and vacate at 15kt or less on on a high speed taxiway.. Not professional at all and that guy learnt it the hard way.