I was on detachment at RAF Luqa, in Vulcan XM 594, in the period 8-15 Nov 77 when this happened (don't remember the exact date). We were taxying back after landing on the southwesterly runway and the 707 was doing approaches to the northerly runway. I was stood on the ladder between the two pilots when I spotted this large object bouncing between the parked Nimrods; how none of them were hit was a miracle.
I am not completely sure but I also seem to remember that a Canberra jumped its chocks in an overnight storm and ran off downhill until it met with the perimiter wire!
3P