July 5 (Reuters) - Vocus Group Ltd VOC.AX said on Wednesday it would allow KKR & Co LP KKR.N to conduct due diligence on a non-exclusive basis, after the private equity giant made a $1.66 billion takeover offer for the Australian internet company in June. believe it is in the best interests of shareholders to grant KKR due diligence to explore whether a potential whole of company proposal is available that takes into account the benefits that the plan delivers," Vocus Chairman David Spence said in a statement. also added that its shareholders do not have to take any action at this time.