514 Sqn Lancaster LL690 was most likely shot down by Oblt Peter Ehrhardt of 9./NJG5 ay Cambrai-Lille-Valenclennes at 00.52 for his 18 victory of the war. He would survive the war with 20 night victories and 1 day victory. All 7 of the crew were killed.
I've already been in contact with Hanna about your uncle, I've made research about LL690 for 5 years and I'm living not far from the crash site (less than 1 km) in the village of Iwuy. I've sent Hanna all the informations I have last January.
If your need more informations let me know throught this forum.