post script...
On 15/16.8.1943 two Wellingtons were claimed over the North Sea by Leutnant Heinz Grimm of IV Gruppe NJG1.
It appears HF596 was one of these aircraft.
Leutnant Grimm claimed 29 aircraft downed with 27 of these confirmed.
He was shot down by German flak over Bremen 8/9.10.1943.
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Bailed out badly burned and died 13.10.1943.
Other crew
Ofw. Walter Czybulka (radar/radio Op.), bailed out and died of injuries
13.10.43,
Uffz. Werner Behrendt (AG), bailed
out, wounded.
Aircraft Identification: Bf110G-4 Serial 5346 Code G9+CE
(Picture of similar aircraft right)
Sources: II/NJG2-IV/NJG1 Abschuss Tafel
Abschusskcommission listings
Private sources in Germany
Leutnant Heinz Grimm photograph courtesy Gerhard Bracke