No they were 3 deg on the main runway 07/25 (now 06/24) and 18 and 12 (11) when I started there; 36 was 4.5 deg, 30 (29) was 3.5 deg. A review of the way the iaps were designed in the early 80s (APATC-1, a 'standard NATO' system) caused the thresholds to be moved and all GP on all runways became 3.5 deg.
24 could actually have been lowered to 3 deg in 2003 but we didn't do it for noise reasons.