The point was that in each case I had throttled to zero before the jump, did not touch the throttle after the drop, I came in through a star, I was dropped out of SC and temp went daft.
That's something I have never experienced or seen reports of before now. Given that Allitnil, Varonica and I have all concurred on that specific point - with best part of 200,000 jumps between us if not more and several hundred close binary drop outs - I think this might be one worth posting on the bug report forum because it's not at all normal.