Tier1 200K route question

Dear Friends, after spending quite a long reading the forum I'm starting to collect documents for Tier1 entrepreneur visa 200k route. I've searched the forum but did not find clear answer. My question is the following: we keep our 200K on the joint personal account(this is not entrepreneur team case) with my wife, wife - is the main applicant, i go as dependent. Do we need to provide letter from the bank only for her like if she keeps the money on her not-joint account? Or I need to provide any kind of 3rd party permission saying that i allow her to transfer the money to the UK etc.

Thank you!