Hi MissVeeBee
This is something you will have to decide for yourself. The DWP don't want you to send any prior evidence because they already have a copy. However, lots of claimants don't trust the DWP to look at previous evidence, so they insist on sending it in again. People have to do what feels right for them.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems