I noticed from FR24 that many SIN-PER flights are being operated by SQ8111 (instead of TR8) and also noticed I got prompted to bid for a ScootBiz upgrade for SIN-PER return (departing Fri, returning Mon). Odd thing is I'm travelling on a booking of 5 pax; in many "bid to upgrade" situations I believe the chance would be extremely low for such large travelling party. It seems all but likely that the flights I'm on are earmarked to be operated by SQ8111 (or at least a very good chance it will be) so they're trying to fill up the additional biz seats for extra revenue. Might give it a shot if that's the case! Cheap upgrade for a lot more comfort IMO.