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From The Blitz Then and Now - Volumes 2 & 3 (After the Battle), for 1941:

Feb 4/5: Do 17Z-3 (wn 2907) of 7/KG2 (U5+AR) shot down by Defiant of No. 151 Squadron; Sgt H. E. Bodien, pilot; Sgt D. E. C. Jonas, gunner.
Feb 10/11: 2 enemy aircraft claimed probably destroyed by Defiants of No. 255 Squadron (no other details).
May 7/8: He 111H-3 (wn 3210) of Stab/KG53 (A1+BA) shot down by Defiant of No. 255 Squadron; Sgt Johnson, pilot; Sgt Aitchison, gunner.
May 7/8: He 111P-4 (wn 2871) of 1/KG55 (G1+LH) shot down by Defiant of No. 256 Squadron; FL E. C. Deansley, pilot; Sgt W. J. Scott, gunner.
May 7/8: He 111P-4 (wn 2874) of 3/KG55 (G1+LL) shot down by Defiant of No. 256 Squadron; PO D. Toone, pilot; FO R. L. Lamb, gunner.
May 7/8: He 111P-4 (wn 2908 ) of 6/KG55 (G1+HP) shot down by Defiant of No. 256 Squadron; FL D. R. West, pilot; Sgt Adams, gunner.
May 7/8: He 111H-2 (wn 2432) of 3/KGr100 (6N+FL) shot down by Defiant (no other details).
May 8/9: He 111H-5 (wn 4006) of 4/KG53 (A1+FM) shot down by Defiant of No. 255 Squadron (no other details).
May 8/9: He 111H-5 (wn 4042) of 6/KG53 (A1+CW) shot down by Defiant of No. 255 Squadron (no other details).
May 8/9: He 111P-4 (wn 3000) of 6/KG55 (G1+FP) damaged by Defiant of No. 255 Squadron, force landed at Long Riston, Yorkshire (no other details).
May 10/11: He 111H-5 (wn 4002) of 3/KG53 (A1+CL) shot down by Defiant (no other details).
June 24/25: no Defiant claims listed