As well as a selection of actual self-inking handstamps, the stand also used an American Tampoprint Entrance 90 machine from Tampotech Ltd. Ironic really, as I had only just posted to our reference site, a write-up on the machines that are currently in use and which have given stirling service at Special Handstamp Centres for many years!
I understand that this machine - which uses basically the same but improved technology and ink - is being evaluated, with the hope that they will be acquired for the handstamp centres. Improvements will mean that postmarks can be applied more accurately especially on larger covers.
I am grateful for permission to take pictures and a video of the operation which isn't as large as I wanted it to be, but is too blurred at full-screen.