Hi Ivor,
On the night of 2/3 Feb 1945, 323 aircraft (277 Halifaxes, 27 Lancasters & 19 Mosquitoes of 4, 6 & 8 Groups) set off for the target Wanne-Eickel oil refinery according to The Bomber Command War Diaries by Middlebrook/Everitt.
At least 8 Halifaxes were lost on this operation. If you could give me the last name of your fathers uncle I can look up which Halifax he was onboard.
Regards
Linzee