Many thanks for the help yesterday.
Ive altered and stressed over this one but still have a corner which will not fit together.
16d Logical conclusion. Diagnoses?
28a Jargon. Slang?
19d Unenclosed space outdoors. Open air?
which leaves me with
23a poisoned. (6) ?e?t?n
27a Plentiful (4) ?a?y
30a Make believe (7) ?r?t?s?
18a in an impressive, daunting way (10) ?o?m?a???y
20d component of a spinning wheel (6) ??b?a?