I have a
book to recommend to you. Heck, I have
two 
Anyways, according to the latter, the attack on Castelveltrano was staged by eleven Blenheims of 18 and 107 Squadrons under favourable circumstances - namely that the Sicilian airfield was heavily watterlogged. No Blenheims were lost in the initial raid, but one machine had to abandon due to engine trouble.
The 18 and 107 Squadron crews claimed 30 a/c destroyed, and a quick follow-up raid was staged by three Wellingtons of 104 Squadron carrying 4000 lb. cookies. Two more follow-up raids by the 104 Squadron Wellingtons resulted in one Wellington being lost.
Still according to Shores, Cull & Malizia, actual Axis losses were six S.82s (one of which was used by the Germans), four Z1007bis, a CR42 and a Ju52 were destroyed; in addition 42 more aircraft were damaged: 22 S.82s, 15 Z1007bis, 2 FN305s, 2 CR42s and an MC200.