At common law, the defining concept of a contract of commercial insurance is of a transfer of risk freely negotiated between counterparties of similar bargaining power, equally deserving (or not) of the courts' protection. The underwriter has the advantage, by dint of drafting the policy terms, of delineating the precise boundaries of cover. The prospective insured has the equal and opposite advantage of knowing the precise risk proposed to be insured in better detail than the underwriter can ever achieve. Central to English commercial insurance decisions, therefore, are the linked principles that the underwriter is bound to the terms of his policy; and that the risk is as it has been described to him, and that nothing material to his decision to insure it has been concealed or misrepresented to him.