Might be a stupid question, but if I get a CDR from Laindon to Custom
House does that only allow travel on Silverlink from West Ham onwards
or can I use tube/DLR as well?

The ticket descriptions on Qjump aren't very clear, but it looks as if
one ticket is £9ish and another is £13ish including a travelcard. Do
I need a travelcard to use non-Silverlink on this short section?

Ian