LACC Multi-Radar Processing.
ATC radars aren't the most accurate of beasts. LACC uses all of the contributing radars to enhance the accuracy of an individual track. I believe the last Mode C to be reported is the one that is used. We should be able to trust this data as the aircraft 'told' the radar. Unfortunately we can't always
West Drayton
Main-Mode only ever used one radar at a time. What it did do was allowed you to set which radar reported for which area (down to 16 mile boxes I've been tolds). So the problem may never have been seen as Claxby may not have been selected for the problem area.
055166k - Both your problems are probably being caused by Mount Gabriel. The ghosting should have disappeared as MRP has been told Mount Gabriel is an 'unreliable' source so should only be used when no other radar is tracking the given aircraft. Unfortunately MRP still uses it Mode C (See comment above)
A I in response to your post
1) Problem only reported after we entered operational service.
2) Can't say never work at West Drayton.
3) Paperwork - I'll leave that to you
4) Couldn't answer that one.
5) The TOI is to increase seperation. The final solution will probably change the Swanwick system, once someone decides what they want to do (ATC, Safety, Engineering etc)
6) I don't work for ATC so can't answer
7) First reported mid-July
In response to your comment
My mischievous mind has to ask whether or not Swanwick would have been declared fit for purpose if those charged with saying so had known about the problem. Finally I have to ask what other gremlins might be lurking and who knows about them. Was the push to "O" date so irresistable that there is more than dust under the carpet?
How dare you call into question the professionalism of the people that slogged their guts out to get LACC operational! 