MrNosy is right - it was about 30 years ago (+/- 5 years). As well as horizontal staggering, one ILS was joined at 3000', the other at 2500' (I think). One crucial point was that all these parallel approaches were monitored by PAR to ensure that separation was maintained, especially checking for overswings when establishing. What will happen now there's no PAR?
[This message has been edited by Hew Jampton (edited 02 May 2001).]