Thank you all very much.
It's the same on every chip.
The scope picture with the two traces shows the input (yellow) and the output (blue) overshoot and ringing.
note: the zero base is different for each to get the whole traces on.
The scope picture with one trace is when I completely disconnected the input probe and jumpers and put as short a ground connection as I could.
(I wondered what those springs were for but now I can't find them!)
The final picture is the rats' nest!

So, this is a common problem with fast switching things is it? Is it only an artifact of the scope rather than a "problem" with the circuit?