Unknown Z80 CPU board and backplane ID anyone?

Hi folks, A friend of mine in the UK is looking for any info on the following boards. The CPU board is marked ?VA 03-907023-00? and features a Z80 with 16K RAM and an 18.432MHz crystal. The backplane is also VA and has 11 132-pin slots that aren?t all identical implying usage for different cards in those locations. Voltages are +5/-5/+12V. Pics: http://www.binarydinosaurs.co.uk/tynemouthsw_2018-Jul-30.jpg <http://www.binarydinosaurs.co.uk/tynemouthsw_2018-Jul-30.jpg> http://www.binarydinosaurs.co.uk/tynemouthsw_2018-Jul-30-1.jpg <http://www.binarydinosaurs.co.uk/tynemouthsw_2018-Jul-30-1.jpg> http://www.binarydinosaurs.co.uk/tynemouthsw_2018-Jul-30-2.jpg <http://www.binarydinosaurs.co.uk/tynemouthsw_2018-Jul-30-2.jpg> http://www.binarydinosaurs.co.uk/tynemouthsw_2018-Jul-30-3.jpg <http://www.binarydinosaurs.co.uk/tynemouthsw_2018-Jul-30-3.jpg> My duckduckgo-fu has let me down. Cheers! -- adrian/witchy Owner of Binary Dinosaurs, the UK's biggest home computer collection? t: @binarydinosaurs f: facebook.com/binarydinosaurs w: www.binarydinosaurs.co.uk