Anyone know why on the DLR, trains from Lewisham to Bank are always
labelled 'Bank via Canary Wharf' but none of the others are.

All Lewisham trains go via Canary Wharf - and I would've thought it
would make more sense to have the 'via Canary Wharf' bit on the return
route - from Bank to Lewisham where there are some trains from Bank that
don't go via Canary Wharf (i.e. the Beckton ones).