BBC local news made a well timed visit, broadcast the evening before the share launch. Here is what was happening behind the camera, and the result is on our videos page,

 Here is Geoff being interviewed.

BBC interviewing Geoff

 BBC, break between takes.

They did quite a few takes, so here we are waiting on the weir while they work out the next shot.

This is Tom Turrell our interviewer doing a Blue Peter thing, pouring water down our Archimedes screw model

 BBC's Tom Turrell operating the model