What sort of train ticket do I need?

[One]

Initially I'll be on the Bedford-Brighton line, and then at some point in London I'll need to get a tube to North Greenwich. National rail doesn't have North Greenwich in its system so I have no idea what sort of ticket I'll need. I'll also need a return which has a high chance of me returning after midnight so a +1 day return.

Can anyone help me out, thanks.

 

[One]

Thanks for the replies.

So I get this right, the only peak time is in the morning before 9:30, there is no peak time at the end of the day until it starts again the next day at 4:30?

 

[One]

Peak time also happens coming out of London from 4pm-7pm, but peak only applies to national rail trains, not the underground. So getting an off peak travel card entitles you to go into London after 9.30am, travel around London in the zone areas at all times (provided you have the correct zones) and then leave London to your original destination (just not in peak hours of 4-7).

It's a couple of quid extra to leave in peak hours, pay the difference on the ticket to the guy at the ticket barrier if needs be, but if you plan your day its never usually worth it.

Ahh, ok, this makes sense now, I did wonder why there would only be one peak time otherwise one could assume people only ever went to Lonson, nobody ever comes back I won't be leaving until 23:30 earliest so this is no problem.

Thanks for all the help to everyone that did