7. We recommend that:(a) The Chiefs of Staff approve the issue of the draft instructions at Annexes A, B and C. (b) The Chiefs of Staff should represent to the Prime Minister the grave security difficulties involved in his decision to absolve the Poles from the obligation to deposit their cyphers with us, with a view to his agreeing to withdraw this concession. (c) If the recommendation at (b) above should prove impracticable the Chiefs of Staff should invite the Prime Minister to represent to the Polish Government that the concession he granted to M.