Biometrics only for main applicant at PEO ??

[timesofindia]

I have completed the biometric for my dependents at post office.
I could not do my biometric at post office because the barcode in the letter did not work for me.

When booking online appointment you can only book for all the applicants and not just for one. So I have booked for all 3 applicants.

I was checking the online UKBA site and it says "Bring all the dependants registered in your application with you to this appointment."

I wanted to ask that do I need to take my dependents along with me for the biometrics at PEO eventhough they have completed their biometric.

Thoughts? I can definitely take the proof that biometrics are done for my dependents at PO.