London CHC>>>>>Who needs to fill in Immigration Summary Form?

[shibleebd]

could anybody guide me on whether all family members need to fill in the Immigration summary form & Supplementary Information form? or is it just the principal applicant?

plzzzz guide....

 

[shibleebd]

also in the signature space of the Immigration Summary Form, who needs to sign? only main applicant or both main applicant & spouse?