Needham Market? I'd reckon we'd be there about 8:30 - 8:45 am or so. Re the trains, it'll probably be a little 2 carriage unit to Ipswich and if it's just 2 or 3 bikes it won't be an issue having them in a couple of doorways, as Ipswich is the next and final stop. When you change at Ipswich, the train to London Liverpool Street could be a long intercity one, usually with a guards van at the end, but the station staff there will be able to advise. It's very unlikely to be an issue with getting bikes on at that time, and just checking now, there are at least 6 bike spaces available on the 09:09, the 09:43 and the 10:09 services from Ipswich.
Pace-wise, I'm not intending to run this as a fast one. We'll go at the pace everyone is comfortable with - after all, we've got all night! So we'll take the time to stop and admire the view, listen to and or watch the nightlife, take some photos, catch your breath etc.