The Pucka Tank Museum rescued this earlier this week. I post photos with permission and I can't get any more as it has been handed over to the Arty Museum.
It is a predictor used as a training aid. What you see is what is there.
Most of the components are seized but would be easy enough free up. However it is off to where it should be hope to see it again on display when the Arty Museum re-opens.
Cheers Easo