.........the type illustrated by Discorde in post 6,
Still have mine, I knew it as The Dalton computer.
Ref: Post # 3.. Mine is identical, except that although also called a Mark 4, it is labelled 6B/490 and labelled a ..........comput
Er.
Manufactured by The Lonodn Name Plate Mfg Co Ltd of London and Brighton, and presented to me by HMQ.Elizabeth.II, via the R.A.F.
Curiouser and curiouser, said Alice.