Typical sink rate on London City steep approach?

[rsiano]

unstable approach - go around mandatory

My apologies for not stating the following from the TWA Flight Crew Operating Policy and relying on a memory that was faulty:
"Stabilized Approach -
The aircraft must not continue descent below 500 feet on any approach unless it is in the landing configuration, stabilized on final approach airspeed and sink rate, with the engines spun up. Any time these conditions are not met when the aircraft is at or below 500 feet, a go-around is mandatory."

Thanks to all of you who drew attention to my incorrect posting information.