When I last flew there in 2008 the high hours requirement was minimum 6000 hours for Captains for the IAC contract, but most had significantly more than this and have been flying to the Shetland islands for years for all the various operators. (Brymon/Brit World/BAF/Flightline) There were some stipulations for F/Os such as time on type (50 hours I think?) but not much else.