Try PM to WWW who is well qualified to answer your questions because he instructed there and is now flying for an Airline.He,s a pretty helpfull guy and im sure he will let you know all what u need.
Bloke on my IR course was leaving his instructing job in London to go work there as soon as he had the tick in the box.The requirements then {March Last year] were as far as im aware
Total 1000 hrs
500 instructional
Current IR
and a towel for your sunbed.
Good luck, im jealous, a job in the sun phewwwwwwwwwwww.