Hi Marius,
with the LGK XI list, I don't believe that you can take it at face value. To put it in to context I believe that you would have to view the original reports as these should describe the unit reporting the crash. Then it should be possible to plot the positions of the reported crashes and to gauge from where and from what distance the observations were made. Are these records infallible? No, I have a LGK XI example of an aircraft observed to crash in to the sea but where the aircraft concerned landed heavily damaged in the UK a couple of hours later.
It seems that you still do not comprehend
the scale and scope of archival material available from the British side, and if you did you would appreciate that to erase a "ghost" formation and losses from history would be next to impossible:
1. Bomber Command records would have to somehow be changed not only for the day concerned, but to retrospectively erase all trace of the machines and men in the "ghost" formation that where lost. The posting in of new aircraft and crews to replace losses would have to be hidden.
2. Aircraft production records and/or aircraft record cards would have to be altered.
3. Any survivors of the "ghost" formation and the multitude of personnel from their squadrons in the UK would have to maintain a vow of silence to their graves.
4. The casualty records would have to be altered and/or destroyed and the families of the missing men would also have to maintain a wall of silence.
Quite frankly, I think the British had more pressing issues in which to expend resources on at that time
Anyway, I would suggest that you start looking at the original source documents and trustworthy written material:
The National Archives, Kew, London:
AIR 27 Series - Squadron Operation Records Books and Appendices - these can be ordered as a digital download
AIR 24/200-201 - Bomber Command Operations Record Book (i.e. war diary) 1936-1940
AIR 24/210-214 - Bomber Command Operations Record Book Appendices 1939-1940
AIR 25/1 - No 1 (Bomber) Group Operations Record Book 1936-1943
AIR 25/22 - No 2 (Bomber) Group Operations Record Book 1936-1940
AIR 25/26 & 27 - No 2 (Bomber) Group Operations Record Book Appendices 1939
AIR 25/51 - No 3 (Bomber) Group Operations Record Book 1926-1940
AIR 25/56 - No 3 (Bomber) Group Operations Record Book Appendices 1939
AIR 25/93 - No 4 (Bomber) Group Operations Record Book 1937-1943
AIR 25/96 - No 4 (Bomber) Group Operations Record Book Appendices 1939-1940
AIR 25/109A - No 5 (Bomber) Group Operations Record Book 1937-1943
AIR 25/111 - No 5 (Bomber) Group Operations Record Book Appendices 1939-1940
AIR 81/62-73 - these are the newly released RAF casualty files relating to the losses on 18 December 1939.
Misc files that may contain information on the 18 December 1939 actions:
AIR 2/4289 - OPERATIONS: Sea Areas (Code B, 55/2/11): Reconnaissance and attacks on German battleships in Heligoland Bight 1939-40
AIR 2/8541 - OPERATIONS: Sea Areas (Code B, 55/2/11): Attacks on German Fleet in Heligoland Bight: points from Bomber Command 1939-40
AIR 14/157 - W.A.7(a)(Attack on Wilhelmshaven): reports on various aspects of operations 1939-1940
AIR 2/3018 - PLANNING: Germany (Code B, 85/2/4): Plan W.A.7(a) (Plan K): Attack on Wilhelmshaven 1938-1942
AIR 14/156 - Operation Wilhelmshaven Area 3 Group 18-12-39 Nos. 149, 9 and 37 Squadrons. 1939-1940
AIR 20/292 - Part I to Plan `K' (W.A.7(a)): Attack on Wilhelmshaven: appreciation by Air Staff 1939
This list is by no means exhaustive. For printed books, besides what has already been mentioned, there are the Air Britain books published on aircraft serials, the Bomber Command Losses series by Bill Chorley, Vol 1 of which has recently been published as an updated and revised edition.
"My feeling is telling me our British friends have concealed something."
Marius, the fundamental question is who is hiding what from whom and why. Since we are dealing with the once classified operational and administrative records of the Royal Air Force, the only answer to that question would be that the RAF could only have to be hiding from themselves, and there would be no logical reason why...
Regards
Rod