Despite earlier assistance, which enabled me to finish the top right, the rest of the right side of this is still giving serious problems.
Assistance with these three may stir my feeble mind......
30A - Bargain to be found in some police state (10)
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18D - Film of a helmeted hornbill - very unusual (3, 8, 4, 3)
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&
57A - Detective's lot to fight important case? (8, 3)
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Always grateful for any assistance