The one shining gem across the pond seems to be Houston. It's now carrying well over 100 pax per flight and that number is growing each month. Who knew there was such demand for what I class as quite a niche route, seems to get a fair few on other forums scratching their heads as to where the traffic is coming from!
Especially considering there are no code shares at all on the MAN-IAH sector, it is sold as a standalone SQ flight number. Just goes to show that if you provide a decent product across the pond and promote it, people will use it.