I personally don't understand that rule myself but there you go.
I can't remember the exact numbers something like 100 hours of a multi engined aircraft over 25 tonnes with total hours in excess of XXXX.
What it means is that you do not need to practice take-offs and landings in the aircraft, just the sim. So the very first time you actually get into the aircraft, take it off, fly it,and land it (ok crunch it) you've got passengers on board...it's a full revenue flight. Being ZFT rated means you do a sim ride after your skill test just to fly the required number or circuits.
You will see 737's and 319's pounding the circuit occasionally these days but no longer will you catch a 747 (or 757, 767, 777) doing it. As this is a BA thread I'm only talking about BA aircraft, other operators may well take 747's into the circuit.