Originally Posted by
NewbieRunner
If you have an EU passport immigration will just wave you through on the way out. On your return to the airport there should be a fast track security channel for C and F pax. Since your SIN flight will almost certainly leave from a C gate you can go through separate security checks for C gates (no experience but I assume there is a fast track channel) which shouldn't be too busy.
Terminal A,B and C has a fast track security lane, which you can use, when you fly business and first. Also FTLs, SENs and HONs can use it. And *G members too.