Unnecessary low flying has always been a thorny subject - fun though it might seem at the time.
I once queried why we wasted fuel doing lo-lo-lo transits to Wales from Wattisham to do our LLOLPI training in the 'toom rather than going hi-lo-hi to get another LLOLPI split in the area. No real answer - I feel that the transits were indeed unnecessary low flying.
As was the stupidity of a certain QWI who thought that a 3-ship low level transit from the North Sea to Wattisham at 2100 hrs one summer evening was sensible. Had the phones red hot with complaints at his few minutes of unnecessary low flying, that did. Then another idiot coasted in at low level in the wrong location and went underneath a hovering helicopter at Beccles airport which had a CAA checker on board....... Both came from the "We did it all the time in RAFG" school of thought.